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11/22/2017 10:05:29 PM
Posted: 9/30/2004 4:23:53 PM EST
[Last Edit: 9/30/2004 4:24:27 PM EST by pdmcghinnis]
I just bought a new 16" A3 M4 upper from Model1Sales and really like it. Trouble is, I already have one and I've decided I would like a change.

Assuming I replace the FSB with a shaved gas block, is it possible to install a rifle length FF tube on the 16" barrel? If so, are there any special cinsiderations to keep in mind? I intend to place a flip-up FS on the top rail to go along with the rear ARMS 40.

If someone has done this, do you have any pics of the final product?
Link Posted: 9/30/2004 6:17:30 PM EST
Sure, as long as the gas block fits under the tube, it's fine.

Link Posted: 9/30/2004 7:06:57 PM EST
Link Posted: 9/30/2004 7:43:18 PM EST
Hey, thanks for the help.

Any particular gas block/FF rail combos that just won't work together. Which combo of gas block and FF rail work best?
Link Posted: 9/30/2004 7:45:20 PM EST
I recommend looking at the PRI low-pro gas block. Knights also makes one about 40% more expensive.

The 6.8SPC upper MSTN built for me has a mid-length gas system with the PRI gsa block under a full rifle-length PRI GenIII float tube.

Link Posted: 10/2/2004 11:43:34 AM EST

9mm RRA... FF is a little much, but I like it...
Link Posted: 10/2/2004 2:52:44 PM EST
Link Posted: 10/2/2004 4:09:34 PM EST

Originally Posted By JTAC_Supply:
Hey Spooky, what magwell adapter is that, and what mags does it use?


I don't know what block it is, but I believe it uses uncut Uzi mags.
Link Posted: 10/2/2004 4:38:26 PM EST

Originally Posted By JTAC_Supply:
Hey Spooky, what magwell adapter is that, and what mags does it use?


Looks like a VM Hy-Tech.
Link Posted: 10/2/2004 6:20:29 PM EST
[Last Edit: 10/2/2004 6:21:00 PM EST by Spooky130]
Correct - it is a VM Hy Tech, and uses unmodified Uzi mags (IMI are golden, some others are a bit tight). Shoots pretty good but I'm thinking about putting an EoTech on it...


U-dog has it's big brother a couple posts up!
Link Posted: 10/2/2004 6:42:20 PM EST
There is a thred floating around that states it is hard (not ipossible) to use the LaRue rifle length tube, b/c you can't do the gas system first.
Link Posted: 10/2/2004 6:46:40 PM EST
I can tell you that Using a SPR type block requires a bit of clearence work on the bolck to clear the DD tube,...
Spook I just noticed the Green! looks good
Link Posted: 10/2/2004 6:50:41 PM EST
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