"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
Furthermore, if I was to have the gas block pinned but then change the block to another in the future, would the pin hole size be applicable to other gas blocks?
i was told by a fairly well respected gunsmith that pinning a low profile gas block is completely unnecessary.
Just my opinion but pinned is better, always. Screws come loose, Loctite makes it less likely but not impossible.
Not saying "if it can come loose it will", but I will say "if it can come loose it might".
The good thing about a lo-pro GB is that it doesn't need to be so elaborate as two tapered pins-- because you don't have a 2 1/2" steel lever (front sight base) to attach. There's no big lever in place to get bumped. many lo-pro GB's will be well protected under the hand guard.
For me the set screws are there to hold it in place while I cross-pin it. A 1/8 or 3/16 split pin is adequate.
I pin all mine. Just too easy to do. Granted I dont taper-pin them I just use a coiled stainless roll pin I pick up from BRDEngineering. My go to lo-pro block is the SLR GB7-PIN with a pinning flat already on the block ready to go.
Rainier Extended .750 on a Spikes Optimum Profile Barrel
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Last edited by jataylor11; 09-19-17 at 11:15.
So if I get a BRD for SLR jig, do I need a drill press or a vise + hand drill?
Also, I emailed Jake Carlson of BRD and asked if it matters which dimpling jig I get if I only intend to drill one dimple -making sure it's the same profile width. He replied, "No sir, all of the jigs do one dimple under the gas port."
Last edited by Hulkstr8; 09-19-17 at 13:23. Reason: Adding Info
Yes, I would use a vice. Lots of dimple jigs out there, I use the SRL because I already had an SRL gas block and my SRL jig does two dimples not just one.
https://www.youtube.com/watch?v=m203m8jMYOk
DDM4V11 PRO, SSA-E, Vortex viper 6.5x20-44mm
BCM 16 KMR-A, SSA, EO Tech EXPS 3-0, G-33 magnifier
S&W M&P Sport II, BCM PNT, Aimpoint PRO
BCM 9" 300 BLK upper/KAC lower/DD BCG/ BCM PNT/ Aimpoint T1
Noveske upper/lower/handguard, 20" 6.5 Grendel Bartlein Barrel, SSA-E,Vortex viper GEN II PST 5x25-50mm
16" BCA .223 Wylde "budget rifle", SPARC AR
Retired Army Airborne Infantry
Wasn't there a thread here a while back where pinning, set screws, and clamp on blocks were compared? I want to say dimpling the barrel had some affect on the bore, where pinned had much less of an affect. I can't remember if the difference was enough to even matter, but I decided to pin the Geissele gas block on my most recent SPR build anyway due in part to the info posted in that thread.
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