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The first project undertaken by the company was an injection molded AR-15 rifle lower receiver. The company then moved to AR-10 style rifle lower receivers, and finally pistol receivers. [14] The name of the company refers to the injection molding process combined with the common designation of unfinished receivers as "80% receivers". [14]
An image of the DEFCAD Charon AR-15 family. The DEFCAD Charon is an open source [ 1 ] 3D-printable AR-15 lower receiver project that was partially inspired by the Fabrique Nationale P90 . It began as a design exercise by a DEFCAD user to explore FDM additive manufacturing technology as a means of integrating the P90's ergonomics into a stock ...
The AR Lower V5 is a 3D printed lower receiver for the AR-15 rifle. [1] It was created in March 2013 Defense Distributed printed using the Stratasys Dimension SST 3-D printer [1] [2] using the fused deposition modeling (FDM) method. [2] The receiver was able to handle enough stress to fire more than 600 rounds. [1]
Bushmaster Firearms originally produced their 'First Generation' rifle using an aluminum lower receiver and a stamped steel upper receiver. This first-generation model used a long-stroke gas piston operating system. The recoil spring was within the upper barrel gas system compared to the AR-15/M-16, where the recoil spring is within the butt stock.
Stag advertises that all their weapons and accessories are made in the United States. They are best known for their left-handed AR-15 rifles, which use a mirror imaged upper receiver and have the ejection port reversed for left-handed shooters and the safety selector control on the right side of the lower receiver. [1]
The WarFairy P-15 is a 3D printed Fabrique Nationale P90 stock [1] [2] [3] made public around May 2013. [1] It was printed using a LulzBot Taz printer [4] via the fused deposition modeling (FDM) method. [5] It was created by WarFairy [2] [3] The stock works a lower receiver for the FN-P90 but would work with any standard AR. [4]
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
The AR-10 is slightly larger and heavier than the AR-15. It was originally designed to chamber the military 7.62x51 NATO cartridge (also .308), which has a COAL of 2.800" (71.12mm) 45 Raptor , uses the standard 7.62 NATO case, cut to a length of 1.800" from 2.015", resulting in a straight-wall cartridge, neck is sized to 0.452".