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KeyMod is a universal interface system for firearm accessory components designed to supersede the MIL-STD-1913 accessory rails.^[1] The concept was first created by VLTOR Weapon Systems of Tucson, Arizona, and released through Noveske Rifleworks of Grants Pass, Oregon, before being published open sourced in the public domain for adoption by the entire firearms accessory industry.^[2][3][4] The name 'KeyMod' was coined by Eric Kincel (then working for VLTOR Weapon Systems) following the naming trend of other VLTOR accessories with the suffix 'Mod' meaning modular, and 'Key' being a reference to the key-hole profile of the mounting slots.

Description[edit]

KeyMod is an open-source design released for use and distribution in the public domain in an effort to standardize universal attachment systems in the firearm accessories market. The KeyMod system is intended to be used as a direct attachment method for firearm accessories such as flash light mounts, laser modules, sights, scope mounts, vertical grips, rail panels, hand stops, barricade supports, and many others.^[5] The goal is to eliminate the need for the rail to be fully outfitted with 1913 rails covering the entire handguard. The KeyMod system allows a user to place MIL-STD-1913 rails wherever needed (even in the 45° positions at times). The KeyMod system consists of two parts: the KeyMod slot and the KeyMod nut. The slot is distinctive with a larger diameter through-hole combined with a narrow slot. The slot is chamfered on the backside while the through hole is sized for clearance of a quick-detach sling swivel (approximately 3/8' diameter).

The nut is stepped and the larger diameter end is chamfered around 270 degrees of its diameter. The angled face created is meant to interface with the chamfer on the backside of the KeyMod slot. The full diameter is left intact to create two flats on the nut which align the nut to the slot, and allow it to be indexed to the accessory as well as to the KeyMod slot. This eliminates the need to align the nuts to the holes prior to accessory installation as well as the need for tools to tighten the screw/nut. In most accessories, the screw is swaged after assembly to ensure that it cannot be backed out of the nut. This prevents loss of small parts (screws, nuts or other small parts used in the assembly of the accessory). The spacing of the holes is critical and is based on MIL-STD-1913 spacing to allow the greatest modularity with existing accessories.

The KeyMod specifications call out a 'recoil lug' on the accessories which is intended to interface with the larger through hole portion and resist slippage of accessories during counter-recoil. The combination of the angled interface of the nut to the KeyMod slot and the recoil lug to the through hole make for a very strong attachment point which will not slip under harsh recoil or counter recoil. It also provides for an excellent return-to-zero when removed and re-installed.

History[edit]

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VLTOR Weapon Systems had previously pursued a design which was the basis for the KeyMod system. While developing the first prototype systems Eric Kincel of VLTOR Weapon systems was approached by John Noveske of Noveske Rifleworks with a design for a universal accessory attachment system. After a short collaboration, during which Todd Krawczyk of Noveske Rifleworks suggested an improvement to the accessory lock/anti-rotation nut, John Noveske decided to adopt what became the KeyMod system for the NSR series of hand guards and accessories.^[6] Kincel's design was developed simultaneously, but without knowledge of the independently developed keyhole slot system by Accuracy International, until after KeyMod's release.^[7]

The specifications for the KeyMod system were first published in July 2012. The current revision was released in October 2012.

Technical specifications[edit]

The specifications for the KeyMod system were initially released by VLTOR Weapon Systems as an open-source set of drawings. As such, some manufacturers have added their own variations on the system such as using the through-hole portion as a sling-swivel attachment point. The critical interface dimensions, however, still follow the specifications. In an effort to ensure interface dimensions are kept consistent and repeatable, Bravo Company MFG released a set of drawings for KeyMod gauges that allow for expedient inspection of the 100° chamfer feature in January 2014.

• KeyMod Slot details

• KeyMod nut details

• KeyMod accessory details

• KeyMod nut/screw assembly details

• Complete PDF

See also[edit]

• Rail Integration System, generic term for a system for attaching accessories to small firearms
• Weaver rail mount, early system used for scope mounts, still has some popularity in the civilian market
• Picatinny rail (MIL-STD-1913), improved and standardized version of the Weaver mount. Used both for scope mounts and for accessories (such as extra sling mounts, vertical grips, bipods etc.). Major popularity in the civilian market.
• NATO Accessory Rail- further development from the MIL-STD-1913
• UIT rail, an older standard used for mounting slings particularly on competition firearms
• M-LOK - free licensed competing standard to KeyMod
• Zeiss rail, a ringless scope mounting standard

References[edit]

1. ^Slowik, Max. 'New Open-Source KeyMod Universal Mounting System by Vltor'. Guns.com. Retrieved 3 August 2015.
2. ^Curtis, Rob. 'VLTOR gives the keymod tdp to you'. Militarytimes.com. Archived from the original on 26 February 2014. Retrieved 9 April 2013.
3. ^Wiley, Suzanne. 'Fad or the Future? The KeyMod Rail System'. cheaperthandirt.com. Retrieved 20 February 2015.
4. ^Fortier, David. 'Mod Squad: Is KeyMod the New Industry Forend Standard?'. rifleshootermag.com/. Retrieved 20 February 2015.
5. ^Muramatsu, Kevin (25 November 2014). Gun Digest Guide to Customizing Your AR-15. Gun Digest Books.
6. ^Chin, Cass. 'Noveske NSR Handguard'. Military Morons. Retrieved 9 April 2013.
7. ^[1] (25 July 2012). 'Introducing the Vltor KeyMod system' (Press release). Eric S. Kincel, Vltor Weapon Systems. Retrieved 23 January 2015.

Client–server model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients.^[1] Often clients and servers communicate over a computer network on separate hardware, but both client and server may reside in the same system. A server host runs one or more server programs, which share their resources with clients. A client does not share any of its resources, but it requests content or service from a server. Clients, therefore, initiate communication sessions with servers, which await incoming requests.Examples of computer applications that use the client-server model are email, network printing, and the World Wide Web.

Client and server role[edit]

The client-server characteristic describes the relationship of cooperating programs in an application. The server component provides a function or service to one or many clients, which initiate requests for such services.Servers are classified by the services they provide. For example, a web server serves web pages and a file server serves computer files. A shared resource may be any of the server computer's software and electronic components, from programs and data to processors and storage devices. The sharing of resources of a server constitutes a service.

Whether a computer is a client, a server, or both, is determined by the nature of the application that requires the service functions. For example, a single computer can run a web servers and file server software at the same time to serve different data to clients making different kinds of requests. Client software can also communicate with server software within the same computer.^[2] Communication between servers, such as to synchronize data, is sometimes called inter-server or server-to-server communication.

Client and server communication[edit]

In general, a service is an abstraction of computer resources and a client does not have to be concerned with how the server performs while fulfilling the request and delivering the response. The client only has to understand the response based on the well-known application protocol, i.e. the content and the formatting of the data for the requested service.

Clients and servers exchange messages in a request–responsemessaging pattern. The client sends a request, and the server returns a response. This exchange of messages is an example of inter-process communication. To communicate, the computers must have a common language, and they must follow rules so that both the client and the server know what to expect. The language and rules of communication are defined in a communications protocol. All client-server protocols operate in the application layer. The application layer protocol defines the basic patterns of the dialogue. To formalize the data exchange even further, the server may implement an application programming interface (API).^[3] The API is an abstraction layer for accessing a service. By restricting communication to a specific content format, it facilitates parsing. By abstracting access, it facilitates cross-platform data exchange.^[4]

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A server may receive requests from many distinct clients in a short period of time. A computer can only perform a limited number of tasks at any moment, and relies on a scheduling system to prioritize incoming requests from clients to accommodate them. To prevent abuse and maximize availability, the server software may limit the availability to clients. Denial of service attacks are designed to exploit a server's obligation to process requests by overloading it with excessive request rates.Encryption should be applied if sensitive information is to be communicated between the client and the server.

Example[edit]

When a bank customer accesses online banking services with a web browser (the client), the client initiates a request to the bank's web server. The customer's login credentials may be stored in a database, and the web server accesses the database server as a client. An application server interprets the returned data by applying the bank's business logic, and provides the output to the web server. Finally, the webserver returns the result to the client web browser for display.

In each step of this sequence of client-server message exchanges, a computer processes a request and returns data. This is the request-response messaging pattern. When all the requests are met, the sequence is complete and the web browser presents the data to the customer.

This example illustrates a design pattern applicable to the client–server model: separation of concerns.

Early history[edit]

An early form of client-server architecture is remote job entry, dating at least to OS/360 (announced 1964), where the request was to run a job, and the response was the output.

While formulating the client–server model in the 1960s and 1970s, computer scientists building ARPANET (at the Stanford Research Institute) used the terms server-host (or serving host) and user-host (or using-host), and these appear in the early documents RFC 5^[5] and RFC 4.^[6] This usage was continued at Xerox PARC in the mid-1970s.

One context in which researchers used these terms was in the design of a computer network programming language called Decode-Encode Language (DEL).^[5] The purpose of this language was to accept commands from one computer (the user-host), which would return status reports to the user as it encoded the commands in network packets. Another DEL-capable computer, the server-host, received the packets, decoded them, and returned formatted data to the user-host. A DEL program on the user-host received the results to present to the user. This is a client-server transaction. Development of DEL was just beginning in 1969, the year that the United States Department of Defense established ARPANET (predecessor of Internet).

Client-host and server-host[edit]

Client-host and server-host have subtly different meanings than client and server. A host is any computer connected to a network. Whereas the words server and client may refer either to a computer or to a computer program, server-host and user-host always refer to computers. The host is a versatile, multifunction computer; clients and servers are just programs that run on a host. In the client-server model, a server is more likely to be devoted to the task of serving.

An early use of the word client occurs in 'Separating Data from Function in a Distributed File System', a 1978 paper by Xerox PARC computer scientists Howard Sturgis, James Mitchell, and Jay Israel. The authors are careful to define the term for readers, and explain that they use it to distinguish between the user and the user's network node (the client).^[7] (By 1992, the word server had entered into general parlance.)^[8][9]

Centralized computing[edit]

The client–server model does not dictate that server-hosts must have more resources than client-hosts. Rather, it enables any general-purpose computer to extend its capabilities by using the shared resources of other hosts. Centralized computing, however, specifically allocates a large amount of resources to a small number of computers. The more computation is offloaded from client-hosts to the central computers, the simpler the client-hosts can be.^[10] It relies heavily on network resources (servers and infrastructure) for computation and storage. A diskless node loads even its operating system from the network, and a computer terminal has no operating system at all; it is only an input/output interface to the server. In contrast, a fat client, such as a personal computer, has many resources, and does not rely on a server for essential functions.

As microcomputers decreased in price and increased in power from the 1980s to the late 1990s, many organizations transitioned computation from centralized servers, such as mainframes and minicomputers, to fat clients.^[11] This afforded greater, more individualized dominion over computer resources, but complicated information technology management.^[10][12][13] During the 2000s, web applications matured enough to rival application software developed for a specific microarchitecture. This maturation, more affordable mass storage, and the advent of service-oriented architecture were among the factors that gave rise to the cloud computing trend of the 2010s.^[14]

Comparison with peer-to-peer architecture[edit]

In addition to the client–server model, distributed computing applications often use the peer-to-peer (P2P) application architecture.

In the client–server model, the server is often designed to operate as a centralized system that serves many clients. The computing power, memory and storage requirements of a server must be scaled appropriately to the expected workload. Load-balancing and failover systems are often employed to scale the server beyond a single physical machine.^[15][16]

In a peer-to-peer network, two or more computers (peers) pool their resources and communicate in a decentralized system. Peers are coequal, or equipotent nodes in a non-hierarchical network. Unlike clients in a client–server or client–queue–client network, peers communicate with each other directly.^{[citation needed]} In peer-to-peer networking, an algorithm in the peer-to-peer communications protocol balances load, and even peers with modest resources can help to share the load.^{[citation needed]} If a node becomes unavailable, its shared resources remain available as long as other peers offer it. Ideally, a peer does not need to achieve high availability because other, redundant peers make up for any resource downtime; as the availability and load capacity of peers change, the protocol reroutes requests.

Both client-server and master-slave are regarded as sub-categories of distributed peer-to-peer systems.^[17]

See also[edit]

Notes[edit]

1. ^'Distributed Application Architecture'(PDF). Sun Microsystem. Archived from the original(PDF) on 6 April 2011. Retrieved 2009-06-16.
2. ^The X Window System is one example.
3. ^Benatallah, B.; Casati, F.; Toumani, F. (2004). 'Web service conversation modeling: A cornerstone for e-business automation'. IEEE Internet Computing. 8: 46–54. doi:10.1109/MIC.2004.1260703.
4. ^Dustdar, S.; Schreiner, W. (2005). 'A survey on web services composition'(PDF). International Journal of Web and Grid Services. 1: 1. CiteSeerX10.1.1.139.4827. doi:10.1504/IJWGS.2005.007545.
5. ^ ^abRulifson, Jeff (June 1969). DEL. IETF. doi:10.17487/RFC0005. RFC5. Retrieved 30 November 2013.
6. ^Shapiro, Elmer B. (March 1969). Network Timetable. IETF. doi:10.17487/RFC0004. RFC4. Retrieved 30 November 2013.
7. ^Sturgis, Howard E.; Mitchell, James George; Israel, Jay E. (1978). 'Separating Data from Function in a Distributed File System'. Xerox PARC.Cite journal requires journal= (help)
8. ^Harper, Douglas. 'server'. Online Etymology Dictionary. Retrieved 30 November 2013.
9. ^'Separating data from function in a distributed file system'. GetInfo. German National Library of Science and Technology. Archived from the original on 2 December 2013. Retrieved 29 November 2013.
10. ^ ^abNieh, Jason; Yang, S. Jae; Novik, Naomi (2000). 'A Comparison of Thin-Client Computing Architectures'. Academic Commons. doi:10.7916/D8Z329VF. Retrieved 28 November 2018.
11. ^d'Amore, M. J.; Oberst, D. J. (1983). 'Microcomputers and mainframes'. Proceedings of the 11th annual ACM SIGUCCS conference on User services - SIGUCCS '83. p. 7. doi:10.1145/800041.801417. ISBN978-0897911160.
12. ^Tolia, Niraj; Andersen, David G.; Satyanarayanan, M. (March 2006). 'Quantifying Interactive User Experience on Thin Clients'(PDF). Computer. IEEE Computer Society. 39 (3): 46–52. doi:10.1109/mc.2006.101.
13. ^Otey, Michael (22 March 2011). 'Is the Cloud Really Just the Return of Mainframe Computing?'. SQL Server Pro. Penton Media. Archived from the original on 3 December 2013. Retrieved 1 December 2013.
14. ^Barros, A. P.; Dumas, M. (2006). 'The Rise of Web Service Ecosystems'. IT Professional. 8 (5): 31. doi:10.1109/MITP.2006.123.
15. ^Cardellini, V.; Colajanni, M.; Yu, P.S. (1999). 'Dynamic load balancing on Web-server systems'. IEEE Internet Computing. Institute of Electrical and Electronics Engineers (IEEE). 3 (3): 28–39. doi:10.1109/4236.769420. ISSN1089-7801.
16. ^'What Is Load Balancing? How Load Balancers Work'. NGINX. June 1, 2014. Retrieved January 21, 2020.
17. ^Varma, Vasudeva (2009). '1: Software Architecture Primer'. Software Architecture: A Case Based Approach. Delhi: Pearson Education India. p. 29. ISBN9788131707494. Retrieved 2017-07-04. Distributed Peer-to-Peer Systems [...] This is a generic style of which popular styles are the client-server and master-slave styles.