I received my RRA 9mm upper with ramped bolt from ADCO. It works just fine with a RRA 2 stage FCG, with a CMT notched hammer and with a DPMS un-notched hammer.
I have read in TOS that MGP is the man for the ramp job. Whats the difference between his job vs ADCO's?
Anyone here have a pic of a RRA UNRAMPED bolt. This is my first time with 9mm AR and havent seen an unramped one. I have curiosity as how much metal was removed from the bolt.
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