I believe it is the Sentry9 .936 set screw adjustable gas block. Has about 60 rounds fired using this block. $80.00 dollars and I will ship it to you. Going to have to send a check or work out something, new they are 114and some change (I think). Thanks for looking BANG BANG!! DOES NOT COME WITH THE ROLL PIN SO YOU WOULD HAVE TO GET ONE!!!
.936 SLR adjustable gas block
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