Originally Posted by
Ruark
I have a 2016 S&W M&P 15 Sport that has served me well as a ranch gun and "nightstand AR." Not a lot of fancy furniture: Streamlight, quad rail, red dot, muzzle brake/compensator, etc. Last year I did some reliability upgrades. By "reliability," I mean, "if my life depended on that 10,000th round going off." So far it's been some trigger work, a Sprinco Orange buffer spring (good for 1.5 million cycles), Sprinco Heavy Duty extractor spring (200,000+ cycles), an L J H2 buffer, and a Wolff Extra Power hammer spring.
Alan at Sprinco did a great job of setting me up with the spring/buffer combo after I used his form for analyzing the ejection path. Now it's dead-on at 4 o'clock, and much smoother to shoot. Target re-acquisition is noticeably faster, and holy crap, this baby is reliable. It'll shoot till the cows come home.
I changed to the Wolff Extra Power spring after the stock hammer spring took a slight "set" from being stored in a cocked condition (round in chamber, safety on) for several years and started producing an occasional light strike. Problem solved, but I'm not sure about the lifespan of that Wolff EP spring. Just to be optimal, I'm storing it in an uncocked condition, at least for now.
Any suggestions for a next step for reliability enhancement? I thought about replacing the BCG, but it's my understanding that the M&P BCGs (including the extractor) are about as well built as a BCG can be. The ejector spring seems solid. Anything else you would upgrade? Note I'm focusing on reliability here - "that 10,000th round going off," not cosmetics, accuracy, or what spare parts to have on hand. Those are different things.
Right now I'm thinking about the gas ring, maybe a JP Enhanced.... thoughts?
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