The Firing Line Forums - View Single Post - .22lr accuracy: Glenfield Model 60 vs CMMG 20" AR-15 upper?

Microgunner · October 13, 2012, 05:33 PM

I own a CMMG Sierra 22lr upper that I use on my S&W M&P-15T lower.

It is very accurate for a hunting and plinking rifle, although I doubt it would win any championships, and was very reliable until I installed a 3# Timney trigger.
Wouldn't hardly work at all after that.

I fixed the problem by sharpening the CMMG's firing pin and cutting 1.5 coils from the firing pin return spring.

With the 3# trigger I find this set up very accurate, reliable and a joy to shoot.

I would buy it all over again.

October 13, 2012, 05:33 PM	#6
Microgunner Senior Member Join Date: March 6, 2006 Location: Central Florida Posts: 3,324	I own a CMMG Sierra 22lr upper that I use on my S&W M&P-15T lower. It is very accurate for a hunting and plinking rifle, although I doubt it would win any championships, and was very reliable until I installed a 3# Timney trigger. Wouldn't hardly work at all after that. I fixed the problem by sharpening the CMMG's firing pin and cutting 1.5 coils from the firing pin return spring. With the 3# trigger I find this set up very accurate, reliable and a joy to shoot. I would buy it all over again. __________________ *Proud NRA Benefactor Member*