Feeding problems

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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Feeding problems

Postby Linhall450 » Mon Apr 15, 2019 9:16 pm

I have 16” carbine. It will cycle by hand but not when fired. I have 2 bushmaster metal mags and I have a Lancer mag with a Tromix follower. I built the gun with a heavy buffer and spring and when it wouldn’t feed I switched to a standard buffer and spring,same result. Anybody else have this problem?
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Re: Feeding problems

Postby Buckeye45 » Tue Apr 16, 2019 10:18 am

Check to make sure gas block is aligned properly or the gas tube is installed correctly. If it cycles by hand then you know mechanically it’s correct. No response when fired with the standard tells me your not getting enough gas to function. I know this from experience unfortunately.
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Re: Feeding problems

Postby 303hunter » Tue Apr 16, 2019 7:22 pm

Is your barrel dimpled for the set screw on the gas block? There should be small gap between the back of the gas block and shoulder. About the thickness of a credit card.
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Re: Feeding problems

Postby plant_one » Sun Apr 21, 2019 9:32 am

we're gonna need some more info likely. please give as much as you can.

a couple things that may be helpful

- did you build or buy the upper?
- who's (mfg) barrel is it
- adjustable stock or fixed (a2 style) stock
- what brand lower & did you build or buy
- does the lower function normal with another upper of a different caliber?
- what ammo are you using to test with

simple test for you on cycling to help further diagnose...

put a single round in the mag and fire it.

does it Bold hold open (BHO) for you?

if it doesnt, see if you can record it being fired. you may be able to tell if the bolt is cycling back far enough or not. If its not you know you have too little gas and need to look for a blockage or a leak, if it is its likely an overgas problem and you're getting bolt bounce and probably overrunning the follower

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