![]() 300 BlackOut then you are at the mercy of the factory loadings & those can vary quite a bit from brand to brand, or in bullet weight, so don't just tune for one brand/weight unless you intend to only shoot that. If you don't intend to hand-load for the. So, my suggestion is to initially build the gun with a carbine buffer just to get it shooting & broken in, then once you get it broken in you can watch the brass ejection pattern, feel the recoil harshness, then play with heavier buffers or weaker/stronger buffer springs until you get a proper ejection pattern with a somewhat soft shooting gun. (I have a homemade spring tester to compare buffer springs so I can tune with like springs) (but they will usually function with about anything that you toss in the chamber)īuffer springs can also vary enough in load & rate to have an effect on tuning so that also has to be part of the tuning equation. With the short barrels on the pistol builds, those will have a pistol gas port position, so as a rule they will be over gassed & harsh when shooting most factory supersonics. Once you get the gun shooting with reliability & somewhat broken in then you can then start playing with buffer weights, buffer spring tension, load's work up, etc. I usually build the short barrel 300 Blk with a carbine buffer to begin with (this is the best chance of the gun functioning reliably to allow further tuning). But this leaves most over-gassed for most general usage (especially suppressed). 300 BlackOut barrels come with the gas holes drilled too large as that way they will shoot anything without complaints). Just no way to tell you from afar what the best buffer weight will be when the gun is finally broken in & shooting the rounds that you intend to shoot.Ī LOT depends on the barrel gas hole size (Most short. 300 BlackOut is fun round to play with but can take some tuning to get them to shoot a (weak) subsonic round with proper ejection then turn around & get a hotdog supersonic to not over-gas & slam the bolt back with jaw jarring force. That is almost impossible to answer without firing the gun with the buffer spring that you have in in the gun, with the bolt carrier that you have in the gun, with the ammo that you intend to use. ![]() Can anyone provide any personal input? I guess I'm not really sure I understand what the purpose of having the heavier buffer vs. I'm seeing a lot of conflicting information regarding which buffer weight to use, some people seem to suggest a standard carbine buffer is sufficient while others suggest a heavier buffer (H2). Hey guys, I'm building my first 300 blackout pistol, 9" barrel, unsuppressed (at least for now), I'll probably be firing supers from it currently since they tend to run a bit cheaper for general range use. ![]()
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