ok i just recieved my lightweight free float tube from brightflashlites and had a question about the lock ring.
i indexed the tube with the upper with a carry handle like how mongo did his and the only way i could get the slots to line up so that i could put it in a reciever block, was if the tube was backed off of the barrel nut which exposes about 8-10 threads with the lock ring tightened
i have searched for an answer and found pictures where the lock ring was all the way to the rear.
was wondering if this would be a problem? i have tightened the lock ring and the tube is very stable.
normally i wouldnt care but this time i do cause i have put a forearm front site on it and didnt want the front site to walk off on me.
btw my setup with the ff tube is a bushmaster superlight barrel threaded by NFA_INVESTMENTS, yhm rifle length ff tube and yhm front and rear buis. all upper reciever parts including bolt goup and ch came from rb precision. and a pri latch from adco.
thanks for any help that anyone can offer
I would think that 8-10 thread showing on the receiver side of the barrel nut would be a little excessive but is it really a problem, I don't know.
Of the 5-6 rails that I did, I don't remember seeing more than one or two and rarely even that. I'd lock the rail in proper index with the receiver, like you mentioned, then, holding the whole upper in my hands or between my knees, I'd slowly start tapping the locking ring around, using a large flat tipped screwdriver in one of the locking ring slots. IIRC, I also mounted a FVG and that helped me control the whole setup while tightening - it's been awhile since I've done one of these.
I'd tap it until it was pretty tight, then give it two or three relatively hard hits to ensure it was as tight as it could reasonably be.