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buffer spring question? Not locking back BCG....


kimberacp

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16" mid length with rifle buffer and JP buffer spring. BCG is full weight. Ammo chronos at 3000 fps. Does not lock back with empty magazine and will not manual lock back when pulling the handle back.

I can see through the ejection port that the BCG is not going back far enough for the latch to catch on the front of the carrier.

Could the spring be too long?

Am not too concern about the last round not lock back, new magazines could fit that but pulling back the handle and seeing the carrier not going back enough does concern me.

Any ideas.

thanks

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I'm thinking you've got a carbine extension and a rifle buffer.

Might be the spring though. To check, remove spring and buffer, replace buffer in tube, cycle bolt by hand.

Does it stop in the same place or continue farther rearward like it should?

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You don't have a Magpul BAD lever by chance, do you? I've heard they can cause problems with bolts not locking back. But agree that you need to make sure you're not running a rifle length buffer in a carbine tube.

Also, which BCG?

-Mike

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