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Sig Sauer M400 vs. Sig Sauer 516 High Speed Video Comparison

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Uploaded on Feb 9, 2012

http://vuurwapenblog.com/2012/02/09/s...

A high speed video comparison of the Sig Sauer M400 (standard AR-15 carbine) and the Sig Sauer 516 (short stroke gas piston AR) rifles. Same shooter, same ammo.

As I have described previously:

http://vuurwapenblog.com/2012/01/23/h...

The rate at which the bolt carrier assembly recoils rearward can have an effect on reliable extraction and ejection, even if extractor and ejector dimensions and springs are absolutely correct. The period of time during which the bolt is behind the stack of rounds in the magazine, neither traveling rearward or forward, has an effect on reliability in that the magazine may not have enough time to push the next round into place before the bolt comes forward again, resulting in a "bolt over base" malfunction that is most commonly seen on suppressed rifles, as they have much greater rates of fire. Also, high forward bolt carrier velocity can result in extreme bolt bounce, as noted previously, while low forward bolt carrier velocity could mean that there isn't enough force to overcome strong magazine springs, dirt or debris in the action, etc.

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