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1/25/2018 7:38:29 AM
Posted: 2/6/2006 9:26:44 AM EST
Just got a barrel assy for a build and the gas tube hole in the FSB seems slightly too small for the gas tube. Any reason I shouldn't just use a Dremel and open it up a little bit?


Link Posted: 2/6/2006 10:28:50 AM EST
maybe just dirty or has burs.

get something to clean it out first.
Link Posted: 2/6/2006 10:33:20 AM EST
The Bushmaster barrels I've used were a little tight unless the FSB hole was first cleaned with some sort of cleaner or penetrating oil and a Q-tip. Try some Hoppes or break-free on a Q-tip, run it in the hole, swab with dry end of Q-tip, and then insert gas tube. Might find it fits a little better.
Link Posted: 2/6/2006 10:36:52 AM EST

Originally Posted By whisky19:
Any reason I shouldn't just use a Dremel and open it up a little bit?

Yes. Gas leak/blow-by resulting in bolt-overs, FTEs, and short-cycling in general. If you absolutely have to enlarge the hole, use fine grit sandpaper rolled into a tube and work it by hand. It's supposed to be tight.
Link Posted: 2/6/2006 10:55:08 AM EST
[Last Edit: 2/7/2006 12:51:17 AM EST by whisky19]
Thanks guys,

Glad I asked before just going at it with the Dremel.

ETA: Got it in! I got myself some emery cloth at Home Depot and slowly worked the fsb hole with it rolled up in a tube as suggested. I also polished the tube using the emery cloth. I just kept at it until the tube almost slid in. I then lightly tapped the tube in using a plastic hammer and it slid right in. Using a pair of pliers, I twisted the tube back and forth in the hole and it now fits fine, Thanks for the help!


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