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S&W MP 15-22 misfires
otter6412
Member Posts: 91 ✭✭
My S&W MP AR15 in 22 cal has about 3 or 4 failures to fire in each 25 round magazine. CCI 40 gr minimags work great, all other ammo fails. I'm wondering if the firing pin is not making a solid contact. Thanks for any comments.
-Otter
Comments
To make a long story short. Federal Auto Match and American Eagle, is the best .22 ammo, as far as primer sensitivity is concerned. Above conversion unit will go 30/40 rounds, firing this Federal .22 ammo. Before having a FTF. Other ammo, like Federal Champion, will have 2/3 FTF's per mag.
Some experienced drifting hammer and/or trigger pins..Make sure yours are a tight fit in the receiver..There's a kit for the MP15-22..
http://tinyurl.com/yalebkya
Don't over-lube the bolt-Best to lube the receiver rails lightly..
That said, I agree with Joe.. Those appear to be strong hits.. Maybe ammo, even though CCI mini-Mag is a first choice.. That's about all I shoot..I've had no issues with mine..I lightly lube, but didn"t need the pins..
I have access to a Browning Buckmark that does the same thing and marks the case in a similar way. I think the firing pin is striking to far out on the rim. I hoping I can just reform the end of the pin to correct the issue. Might take a whole lot more work to correct the channel the pin runs in.
This ^^^....you're getting a solid hit, it's just not deep enough towards the case center to get a good bite on where the primer compound is. You may have better luck with ammo marked "Eley Primed" like Aguila or some of the match ammo until you get the FP problem worked out.