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Posted: 5/18/2004 4:41:50 PM EDT
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I am looking for a smooth gas block for a Oly SUM bull barrel. Brownell's has a GB systems that says it is for a .940 barrel. I measured mine with a caliper and get .936 does anyone know if this will work? Seems like .940 is a odd size compaired to the other brands listed. Could this be a mistake? I cant find a web site or phone number for GB Systems. Does anyone have one? Can you tell me if it is black? Thanks for the info, Brian |
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Brian, I just built an upper with an OLY SUM barrel...it's .750 at the gas block, and thicker from there to the breach end. Yankee Hill makes a very nice bolt on gas block called the Specter...it looks like the DPMS gas blocks...it's not railed, and is pretty low profile. I'd shoot you a pic, but the carbine it's on has a full length tube, so you can't see it. Armalite and RRA make railed gas blocks...I'm using the Armalite on my SUM barrel since I had one sitting in a drawer. It doesn't cover the area that shows once you pull the FSB off...you can see it at the extreme right edge of this pic..it's the shiny silver bit:  Model 1 also has a railed gas block, but it weighs a ton...I've got one, but haven't used it on anything because of the weight. It's about twice the size of the one in the pic. I know the Yankee Hill combo flip up sight/gas block will cover this area...I've got that on another rifle. I'm *pretty* sure the the YHM Specter block does cover this as well, but I'm not 100% certain. I could take a peek when I get home tonight if you need me to. If you don't mind the cosmetic aspect of that area showing, then any standard .750 gas block will work. |
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