8/29/2023 0 Comments M1a vs m1 garandThe slamfire deterrence provided by the MilSpec primer is simply a measure of insurance against such misuse.Īs long as regular primers are seated to the proper depth, and proper feeding/handling procedures are followed, the likelihood of a slamfire is thereby significantly reduced.įor the M1, I use Rem brass, Win WLR primers, 50.0gr of IMR-4064, and a 147-155gr FMJBT or FMJ bullet. The very existence of such MilSpec primers is largely a testament to the simple fact that military personnel will always find a way to misuse their equipment. The process of stripping the round and feeding it from the magazine imposes deceleration on the bolt's forward motion that limits firing pin velocities to within safer limits. ![]() This bypasses design safety features that are based on always feeding each and every round from the magazine, even if you're single feeding. While MilSpec primers are a definite safety boon, most of the instances of slamfires are due to improperly hand chambering cartridges. ![]() So heed the popular precautions regarding propellant speeds and bullet weights. Once an oprod is bent, it's toast and locating a replacement can be a serious enterprise all by itself. Of the two, the M1A has somewhat better tolerance for mismatched speeds and weights, but is NOT impervious to such types of damage. The key issues with the M1 and M1A are port pressures and oprod flex.įaster powders and limits on bullet weights will tend to reduce the stress on these critical parts.
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