I polished the engagement surfaces on the OEM trigger and eliminated the gritty feel, but it still had a long, creepy pull and a long reset. Being way to cheap to drop $200+ on a modular competition trigger I decided to try the Rock River Arms 2-stage AR trigger (AR0093NMK). Installation took about 5 mins and new pins are included. Nice smooth and light (maybe 1lb) 1st stage and a crisp (and short) 2nd stage release that feels like 4-5lbs. Resets right at the start of the 2nd stage. Perfect!
Took it out to the range and it worked flawlessly ...until I emptied the first mag. Dang, no bolt lockback. Several more trials with the same result. Everything was well lubed, using HV CCI loads. I had noticed after installation that the RRA has a stiffer hammer spring and lower mass hammer than the OEM setup. I examined a few spent casings and the sure enough the FP indentations were so deep the brass was nearly fractured. Okay, too much energy is being dumped into the FP and brass. Just need to recover it.
Back home I eye the old trigger parts, including the blue hammer spring, sitting on the bench. Hmmm I wonder... Yup, the OEM spring fits like a glove. Hopefully it's not too light for the new hammer.
Back to the range and ...YES!, bolt now cycles fully and lockup works again. No light strikes either. SWEET!
Took it out to the range and it worked flawlessly ...until I emptied the first mag. Dang, no bolt lockback. Several more trials with the same result. Everything was well lubed, using HV CCI loads. I had noticed after installation that the RRA has a stiffer hammer spring and lower mass hammer than the OEM setup. I examined a few spent casings and the sure enough the FP indentations were so deep the brass was nearly fractured. Okay, too much energy is being dumped into the FP and brass. Just need to recover it.
Back home I eye the old trigger parts, including the blue hammer spring, sitting on the bench. Hmmm I wonder... Yup, the OEM spring fits like a glove. Hopefully it's not too light for the new hammer.
Back to the range and ...YES!, bolt now cycles fully and lockup works again. No light strikes either. SWEET!
. Glad to hear everything is working for you again.
