10-05-2022, 08:34 PM
You'll probably need to eliminate any non-standard components in order to simplify the problem.
First off, to me, 26" and a +2 gas port means 2 things to me: plug dwell time is still pretty long but gas pressure for cycling will be low, and relatively late. Compared to a 20". Cmmg does their 20" at +1 or 2 IIRC.
I'd recommend you first of all, take out the SCS and black spring and put in standard carbine buffer and standard carbine spring. standard bolt carrier also. Assuming carbine stock. If it's a rifle stock then you need to use an internal buffer tube shortener and carbine weight/spring, the rifle 5.3 oz weight might be too heavy.
If that does not resolve the issue, you'll probably need to look into enlarging the gas port diameter, this can be done but you have to be careful. I can give some pointers if you get to that.
As long as the chamber itself is not rough or anything, best guess is way under-gassed.
First off, to me, 26" and a +2 gas port means 2 things to me: plug dwell time is still pretty long but gas pressure for cycling will be low, and relatively late. Compared to a 20". Cmmg does their 20" at +1 or 2 IIRC.
I'd recommend you first of all, take out the SCS and black spring and put in standard carbine buffer and standard carbine spring. standard bolt carrier also. Assuming carbine stock. If it's a rifle stock then you need to use an internal buffer tube shortener and carbine weight/spring, the rifle 5.3 oz weight might be too heavy.
If that does not resolve the issue, you'll probably need to look into enlarging the gas port diameter, this can be done but you have to be careful. I can give some pointers if you get to that.
As long as the chamber itself is not rough or anything, best guess is way under-gassed.