I just picked up my 6943 yesterday and when I tried to put a BCM charging handle in the gun it would not budge.

I noticed that there is a screw on the left side of the receiver and a plate on the inside that would be next to the bolt. I have never seen this on a colt upper before. It looks like it is to keep the bolt straight.

Does anybody know what this is for?

That is what is causing the problem.

Regular charging handle works fine and so does a well used viltor.

Thanks

It's a metal plate for the bolt cam pin. The piston versions were chewing the uppers there so they added the plate to all of them.

My 6944 works fine with BCM charging handles.

Maybe a picture of the cam slot in the upper.  It should not cause problems with a charging handle.  It is Curious that to other handles work.  Have you tried the non working CH in a different rifle?

Make sure the plate isn't coming loose. The only part of the charging handle that could interfere with the plate is the very end.

BCM mod 4b handle pictured on a 6944.

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End of the charging handle near the plate.

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The plate should sit flush.

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The charging handle works fine in another colt upper. I will take it out and look at the plate. It seems if it is sticking out it will get worn down quickly.

I had one like this with that protruding plate rubbing the carrier. I sent it back and Colt replaced it with one where the plate was flush.

Got a 6940 with this.... shoots pmc and my reloads Just Fine all day!!

H