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For us of small minds...
Which manufacturers of carbines and uppers provide 'PROPER' gas port diameters for their carbine length gas systems???
Last edited by Clint; 10-14-11 at 11:50.
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
Very informative thread!
I may have missed it but is there an "ideal" gas port size for a 16" mid-length barrel?
It was mentioned in this thread that Colt carbines have a gas port size of between .062 and .064. Does anyone have the gas port sizes on a Colt 20" barrel?
I would also be interested to know if there a difference between the gas port sizes Colt's 14.5 and 16"carbine barrels.
Found what looks to be a reliable data point on the 10.3" Mk18 from
http://en.wikipedia.org/wiki/Close_Q...attle_Receiver
This seems to match closely with Robb's info here>Originally Posted by WIKI
https://www.m4carbine.net/showthread.php?t=74292
Last edited by Clint; 10-13-11 at 23:48.
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
Relative my earlier posts, I'm thinking or ordering this set.
According to dealer:
Increments of .001"
total of ~190 pins
Last edited by rob_s; 10-14-11 at 10:15.
Unless you have a bunch of other things that you want to gauge, I would just focus on diameter specifications of the holes you want to measure, and order just under to ~.010" over, in appropriate steps.
If limited to ARs, I can think of gas ports and FCG hole diameters maybe, but not much else. There are places where you can order just specific, individual guages at ~$2-2.50/pin, and you'll come out $$ ahead. Otherwise, spend the $60, get a complete set like you're looking at, and then realize the bulk of those pins will never be used, unless you have other measuring requirements for non-ARs. Just another option to consider.
http://www.auto-met.com/gage/pin_gage.htm
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