PS90 Headspace

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Junior Member
Posts: 1
Joined: 11 Oct 2009, 12:38

PS90 Headspace

Post by kfouts2 » 03 Jan 2017, 12:46

Can anyone help me check the headspace on my P90 clone? I received a 10.5 inch CMMG and my Form 1 for SBR has been approved. I took it to the range and it is not cycling. The shoulders on the rounds are blown out. I think I have a headspace issue but do not know how to adjust or measure for it. Thanks


Silver Member
Posts: 2911
Joined: 12 Jan 2009, 22:48
Location: SW Michigan

Re: PS90 Headspace

Post by Buffman » 03 Jan 2017, 14:33

Brand new CMMG barrel? What rounds are you firing? What adapter did you use to affix the barrel back into the receiver? Did you remember the spring in the receiver? How tight did you tighten the barrel?

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