by SIGP240 on Sat Dec 13, 2008 6:09 pm
Yank the carrier, pop the cotter key and get that nasty greasy firing pin out and clean it. Then with the right brush, give that firing pin way a cleaning, same with bolt. I even use a leather shoestring and Mother's. I even boil mine with non-sudsing detergent. The spring has to be surgically clean, too.AND OEM Then, only then (when dry) oil with one drop non temperture sensitive lube. All 7 of my AR's behave like yours in the winter. I know, because after the first 100 rounds "warm-up" the gun behaves like it does in warm weather. Also, DPMS bolts are semi-unfinished with tooling marks, radii and a lot of texture you will not see if you spend a little change on a Smith Ent or a Les B. "Match" bolt. You can trick up to Wolff high power hammer spring, but give Yellow Tavern Red. Power sear/trigger springs a try. Best three bucks to spend without dropping ching on Jard 1.5# trigger. I don't know too much about reduced mass hammers, but the dill press treatment can save you 35.00$ in about 2 min. More bang for the buck. I have a sneaking suspicion that is may not all be the fault of PMC brand, as they subcontract for other brands around the world and more shooters would have more complaints as a result. If you have a parts gun, be cautious or hasty assembly and burred chambers. If you are using XM177 Fed in a 223 barrel, read the warnings. The bullet ogive may be engraving with the lands.
Proudly launching lead from a Swiss P-240 at a range near you.