[Hardastarboard]

Yours is one of the best posts on the thread, so I'll ask your opinion on this. Given that the AR is a direct impingement platform, and assuming that at least some of these options have a larger powder capacity, does that possibly impact the functioning of that system, perhaps causing more fouling, more frequent cleaning, etc?

Your thoughts?

[Charles Martel]

Given that the AR is a direct impingement platform, and assuming that at least some of these options have a larger powder capacity, does that possibly impact the functioning of that system, perhaps causing more fouling, more frequent cleaning, etc?

Armalite used the DI gas system design on the AR-10 first, with few changes made when scaling it down to the 5.56. Remember that only a small portion of the combustion gases are diverted to operate the action; only so much is going to flow through that drilled gas port - barrel length probably has a bigger impact on it than case capacity.

Naturally, gunpowder formulation *is* something that designers must be careful with when dealing with the DI design.