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Posted: 6/4/2007 1:42:30 PM EDT
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I'm fitting a JP Trigger to my S&W M&P 15. In the process of safety fitting, I'm realizing now that there's an issue. The thick part of the safety selector that rides in the holes in the lower "sticks out" inside the reciever about 1/16" on both sides. The center is relieved and of course flat in the right spot. (The pic below shows the part of the safety shaft that's causing the problem highlighted in yellow). The rear part of the JP Trigger that contacts the safety is offset to the side highlighted in yellow, causing it to rub up against this thicker, unrelieved part of the safety shaft. The stock trigger that came with this gun has the trigger interface to the safety centered, so it doesn't have this conflict. I can't possibly fit the trigger to the safety since it cannot engage the safety selector, and its probably not practical to fit the safety selector to the trigger setup without more skill/machine tools than I have. My question for you wise men: Is this amount of safety shaft overlap into the internal of the receiver normal? If I get another safety selector, I'm worried I'll just end up with the same problem. Reshaping the existing selector is way out of my skill/tool level. http://www.mobocracy.org/images/safety.jpg |
I don't think I could relieve it in a way that would be even. Its a fair amount of material to remove, even with a dremel, and not exactly easy to get flush & even. |
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Mob, I installed a JP trigger on my AR and had to fit it to the safety. I tried to remove the smallest amount of metal to make it lock. I guess what I'm trying to say is that it is not a bolt in mod and you should be prepared to file or belt-sand to fit. I did not have to file the side lugs, mine needed clearance with the safety cam. I would buy another safety from Brownells or your favorite store and carefully work them with a file. The JP video helped. I think they can fit it for you if you call them. |
I knew it would take fitting -- the disconnector timing wasn't hard at all, but it took a fair amount of stoning. I think I will order a couple of replacement safeties and see what can be done. The oops part of this story is that I didn't notice the lug (I guess that's the right term) overlap with the trigger safety engagement surface until I'd removed .010 from it. I'm hoping with the right safety I haven't ruined the trigger. I emailed JP, too. Maybe they'll cut me some slack because this particular problem wasn't mentioned in the docs or video. |
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As a followup for the thousands of ARFCOM readers: 1) The safety selector on my M&P 15T isn't "normal" compared to a couple of others I looked at. A Bushmaster safety is fully relieved on the portion visible on the interior of the receiver, for example. 2) JP will sell me a bail-out trigger for $25 if I've overmilled mine. It was recommended that I try their adjustable/reversable selector which is adjustable for engagement. This is a no brainer for me, since it might save me replacing my trigger (vs. spending $20 to get a new basic selector only to find I've overmilled the trigger/safety engagement). Hopefully the replacement selector will solve the problem and I'll be back in business. The guy from JP was really nice and quite helpful. I guess I would only suggest that they make a complete package of trigger + safety to make the safety fitting a non-factor. |
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