The holes in the top are to tune the amount and direction of muzzle jump. Not the load.
ETA a video explaining it by Jered the owner of APA. Shows you you use the top holes to tune the jump and direction. Not load tuning. They work well with it. I have used both the Gen 3 Little and Fat Bastards on match rifles.
ETA a video explaining it by Jered the owner of APA. Shows you you use the top holes to tune the jump and direction. Not load tuning. They work well with it. I have used both the Gen 3 Little and Fat Bastards on match rifles.
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