M&P15R ejection problem and solution

[CWM4A1]

[BroncoBob]

Thanks for the detailed information. Great tips on the required clean up. I had rather a big problem with failure to fire, I was getting 1 out 4 to fire. So I sent my Timney Trigger Group back to Timney and they installed a heavier hammer and hammer spring. I hope this solves my problem with the surplus ammo.

[CWM4A1]

When you got your upper (assume it was S&W M&P15R), it should came with the extra power hammer spring painted orange design to be used with standard hammer to take care of the hard primer problem. Since you use Timney, it was design as match trigger so it would use lighter hammer and spring, not enough to take care of extra hard com-block mil-spec primer. I hope the heavy hammer and spring Timney installed would help you, but if not, just use standard trigger/hammer with standard spring and ditch the match trigger set. I just use standard Colt trigger group with standard hammer and have not experience failure to fire yet.

[BroncoBob]

When you got your upper (assume it was S&W M&P15R), it should came with the extra power hammer spring painted orange design to be used with standard hammer to take care of the hard primer problem. Since you use Timney, it was design as match trigger so it would use lighter hammer and spring, not enough to take care of extra hard com-block mil-spec primer. I hope the heavy hammer and spring Timney installed would help you, but if not, just use standard trigger/hammer with standard spring and ditch the match trigger set. I just use standard Colt trigger group with standard hammer and have not experience failure to fire yet.

I got the complete rifle from Wes at TPF, Don't remember any extra power hammer spring. I'll have to check as I still have the orginal trigger group.

[CWM4A1]

If you have complete M&P15R from Wes, than chances are the hammer spring upgrade was implemented until you replace it with the Timney trigger. I'll bet if you put the original trigger back than your gun should run fine. You do have to live with heavier, and possible a lot of creep if you switch to stock trigger. As far as corrosive salt, just make sure you have a spray bottle of Windex original formula that has ammonia in it, disassemble your rifle and spray every part with Windex, wipe it clean than perform regular cleaning process, that should take care of the corrosive salt problem.

[groovielou]

Question about cleaning after firing corrosive ammo. How do you clean the gas tube? (inside) Or do you not need to?

Thanks!

[fusionstar]

Question about cleaning after firing corrosive ammo. How do you clean the gas tube? (inside) Or do you not need to?

Thanks!

cleaning the gas tube is kind of a waste of time.. because you would have to get the crud out the other end which would require you to remove the flash hider/muzzle brake and gas block. I think its a stainless tube anyway. Most people never clean there gas tubes, period. I think 50k PSI takes care of the cleaning.

[CWM4A1]

I do not worry about the gas tube. If it ever gone bad, I will just buy a new one to replace it. If I want to be somewhat anal about it, I would spray windex into the gas tube, than follow by gun scubber/break cleaner to flush everything out.