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View Full Version : Midwest Industries low profile gas block problem


AllMixedUp
07-13-2007, 7:35 AM
First, hello everyone, new Calgunner here, just wanted to say hi.

I'm having a problem with my Midwest Industries gas block.
http://www.bravocompanyusa.com/Midwest-Industries-Low-Profile-Gas-Block-p/mctar%20lpg.htm

I tighten the three screws underneath and use a dab of locktite on each one, but it keeps rattling loose after 100 rounds or so. Last trip to the range, ran smooth at first, then short stroking occurred, which later turned out the gas block came loose.

Anyone know what I might be doing wrong?

shark92651
07-13-2007, 8:13 AM
Are you using red loctite? I just use a little around the gas hole in the barrel (careful to keep it out of the hole) and also on the threads of the screws and I haven't had an issue yet. You may also need to have the barrel ground flat underneath where the set screws make contact. You may want to have a gunsmith attach it. I would contact Randall at AR15Barrels.com - he even frequents this forum a lot lately.

sv_sniper
07-13-2007, 9:17 AM
Have you ever drilled the BBL? For this kind (set screw) of low-profile GBs, you need to cut a flat/flats (as shark said) or drill shallow holes to make better contact/lock.

While drilling shallow holes, be aware not to drill to much to destroy your BBL.;)

bwiese
07-13-2007, 10:09 AM
.... and people wonder why AR front sight/gas blocks use taper pins and not screws...

ar15barrels
07-13-2007, 10:14 AM
http://ar15barrels.com/tech/detent.jpg

I charge $10 to drill a properly located dimple.
I can also pin almost any gas block to the barrel for $20
It will never move after that.

http://ar15barrels.com/tech/pri-pinned.jpg

AllMixedUp
07-13-2007, 10:57 AM
Thanks for the help, I'll take a look at the flat cuts to better the contact points.

AR15Barrels: I'd love to utilize your expertise, but I'm stuck in Sacramento.

ar15barrels
07-13-2007, 12:42 PM
AR15Barrels: I'd love to utilize your expertise, but I'm stuck in Sacramento.

USPS, one day and about $10 fixes that.