Geissele Rail and Barrel Nut Tightness?

[Giggles]

Which of the Geissele rails has a tight lock up with the barrel nut before it is mounted in place? I'm asking because I have heard that with some Geissele rails and barrel nuts the tolerances are loose. Also which rails should I stay away from if I'm worried about the tightness. I would prefer answers from personal experience.

[rvanno]

I’m not sure it matters how tight the rail is as you slide it over the barrel nut BEFORE you tighten it down, but I have a MK 14 that has been bank vault tight for the last couple of years. I’ve been very happy with it.

[labeef]

I own 7 G handguards, and I have never had a problem with tightness of the barrel nut.

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[TexasAggie2005]

I have had 4 Geissele handguards; Mk8, 2x Mk14 & Mk16. All were very tight fit. Geissele has said before (TOS I believe) that they hand pick barrel nuts to match a handguard to ensure a tight fit.

[uffdaphil]

My three MK 4s all have tight fit.

[gunnerblue]

My MK’s 1,2,two 4’s and 8 all fit tightly in the barrel nut.

[noonesshowmonkey]

Every time I have had to assemble a G rail, the fit was so tight that I had to use a nylon mallet to set the rail.

[TommyG]

Every time I have had to assemble a G rail, the fit was so tight that I had to use a nylon mallet to set the rail.

Yup. Grease, sometimes heat and sometimes a little tapping after the other two. I have not run across one that was loose.

[LowSpeed_HighDrag]

My MK16 was super tight.

[vandal5]

I will echo the above. I have a 9.5" MK8, I had to push it on pretty forcibly. I had put a light coat of grease on the barrel nut and along the inside of the rail.

It still was quite tight after removing and installing a few times. I mist have installed and removed it 4 or so times. Rebuilt the upper with new barrel and between mock up, assembly, test firing, and then finally using locktite and pinning the gas block it had been on and off a bunch.

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