
Originally Posted by
mhanna91
Yes, the rail is a 13.8" troy so both holes will be covered. What would be the best way to go about pinning a low profile block? I have seen the jigs used for dimpling the barells for set screws, but have not seen anything like that for actually drilling for a pin. Also, with the factory pin holes exposed to the weather, would they possibly start to rust? Should I coat them with something?
That one company that makes a jig for dimpling also makes one for drilling pin for VLTOR and similar gas blocks.
I don't use one of those. I use a milling machine and mill a flat spot on one side of the gas block (barrel is already mounted in the gas block) and then drill a 7/64" hole through both at the same time and then change drills and drill a 1/8" hole though both. If using sharp drills you should be able to use a straight pin or ream the hole with a taper pin reamer and use a taper pin. Both work excellently.
If you're worried about rust in the holes on the barrel you can use RIG (rust inhibiting grease) on the barrel and holes. It works very well for this application. I sometimes use it on my own parkerized barrels where they'll be covered by a rail. I rub a thick coat of it on and rub it into the finish well. Then wipe off the excess. It'll smoke a lot the first time you get it really hot but it'll still protect against rust etc. It sort of creates a waxy barrier.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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