[Benelli M4 -- Receiver Extension Removal/Reinstallation Guide]

3 hours ago, StrangerDanger said:

I dug out a customer's Regal Metal Works 6 position extension to compare to two M1014's I have laying around. The overall length is definitely different. The threads on the RMW do not extend down the extension as far as the OEM. No idea why they would deviate from the OEM pattern they copied.

So you might want to screw in the RMW about 6 full rotations, and see if that corrects your pistol grip issue.

 

OEM on the left. RMW on the right. Both tubes are set on an even flat surface. My two OEM M1014's are identical height.

Well that definitely confirms my other suspicion. Had gotten the RMW tube but didn’t compare the two before putting it in. I’ll make the adjustments tomorrow.

[Benelli M4 -- Receiver Extension Removal/Reinstallation Guide]

Yeah, that’s most likely the problem. It’s also an aftermarket tube, could thread length be an issue? I made the mistake of tossing the old tube so I’m not sure how long the threaded section should be.

[Benelli M4 -- Receiver Extension Removal/Reinstallation Guide]

Sorry to be reviving old threads but I had a concern after doing a recoil tube replacement. I followed the guide but the issue now is that it seems I may have screwed the tube in too far. Made it flush with the inside flat of the reciever but now the pistol grip just barely threads on, only about two turns and this experience is telling me two threads isn’t enough.

Mostly just curious how many turns should it be normally, and if the tube being fully flush is necessary.