Wow, excellent info in this thread.
With all the lo-pro gas blocks tucked under rails on ARs these days i wonder if these spirol pins make more sense for us too?
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Wow, excellent info in this thread.
With all the lo-pro gas blocks tucked under rails on ARs these days i wonder if these spirol pins make more sense for us too?
Do the HKs use Spirol pins or spring roll pins? Big difference.
Using taper pins I have had the sight tower get canted from receiving a hit to the gas block. I doubt using a less firm mounting solution is a good idea.....
Taper pins are strong, but are also easy to assemble... they do not gall and bend, time is money. The correct size for a FSB pin is a 2/0 pin. A 2/0 pin has a head diameter of 0.141, the taper is 1/4 inch for every foot and the small end size is determined by the length of the pin.
To really impress the chics, the size of the small end is the diameter of the large end, minus (the length of the pin X 0.02083)![]()
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Black River Tactical
BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
BRT EZTUNE Preset Gas Tubes - CAR and MID
BRT Covert Comps 7.62, 5.56, 6X, 9mm
BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
BRT MicroPin Gas Blocks - .750" & .625"
BRT MicroTUNE Adjustable Gas Blocks
BRT CustomTUNE Gas Ports
I have been experimenting with using coil spring pins for a couple of years, allows notching the barrel in the same op as fluting and drilling the gas port. I might lean toward solid pins if I was mounting a bayo, but for a concealed low pro there are advantages, including no risk of bore deformation by driving a wedge perpendicular to it.
so, it sounds like we need a straight, solid pin with a keeper on it.
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