I was having a tough time pulling that one up. What differentiates a fully automatic AR-15, M4, or M16 from a semi automatic one Let's find out 1776 United shirts including Liberty or Death: (use. There are others that appear to be M16 carriers, but apparently have had 1/4" of the rear "sear trip" section milled, and so do not qualify as M16 carriers because they cannot trip a sear. ![]() There are some "hybrid" carriers that do not have this area open and yet only have the 1/2" closed bottom section in the back. On the M16 bolt carriers, the firing pin collar is not exposed. no auto sear is holding back the hammer). This occurs if the hammer is "riding" the carrier back (i.e. This is intended to catch the hammer and prevent firing if the carrier is not fully forward when the hammer releases. Semi-auto versions have either a reduced closed bottom section (about 1/2"), or a completely open bottom (made so that an adapter to M-16 configuration cannot be installed).Īnother difference in the bolt carriers is the additional metal removed on the underside to expose the collar of the firing pin. The M16 bolt carrier will have about a 2" closed section at the rear that actually trips the auto sear in full-auto fire. ![]() Whats the difference between a F/A BCG as compared to a S/A BCG.
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