GPT (Gas tube Pin Tool)

Your Price: $35.00
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Part Number:GPT

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Randy, mallard green GPTs have minor scratches that can't be felt by fingernail or fingers, they're also a darker green than ODG, we marked those down because like Randy, they're imperfect.  As a gas block jig, it'll get scratched and beat on literally, these almost invisible scratches are but cosmetics.

GPT (Gas tube Pin Tool) is a jig tailor made for installing and removing the gas tube roll pin on an AR15/M16 low profile gas block.  Machined in 6061 aluminum and Type III hard coat anodized, GPT makes installing the gas tube pin on a low profile gas block painless.  GPT is designed to be stable and surefooted,  but it is no larger than it has to be, in order to retain a reasonable small footprint on the crowded workbench.

Most low profile gas blocks don't have flats, and are hard to hold steady without requiring 3 hands to install the diminutive gas tube roll pin.  GPT enables the user to install the gas tube roll pin, and remove it as well with ease.

We made its base thick and wide for stability, its base is rebated to allow the user to clamp it down in a vise.  Thoughtful touches can be found on the GPT, from the scalloped finger access recess to the soft, rounded corners and edges, even its green color has a purpose.  Most gas blocks are black, we wanted GPT to be anything but, as we found it more difficult to work on a black gas block that sits in a black jig. GPT's green color provides a pleasant contrast and makes the black gas block stand out.

With a small Neodymium magnet placed on the gas block, it's powerful enough to stand the gas tube roll pin can upright, perpendicular to the gas tube, above the gas tube pin.  With one hand holding the gas block steady in the GPT, one can start tapping on the gas tube roll pin to get it started.

GPT is a collaboration between Modern Armory and Forward Controls Design.  Modern Armory's version can be found here

Compatible with most gas blocks including Modern Armory, our GBF (Gas Block, Forward Controls), BCM, Rainier, VLTOR, Knight's Armament, Badger Ordnance, Daniel Defense, SLR, or other low profile gas blocks based on the original Crane design.

Please measure your low profile gas block dimensions, as some are longer than others.  GPT is made for Crane Mk12 pattern low profile gas blocks, the length of which is 1".  GPT can be modified to accommodate longer gas blocks.  If you're unsure, please contact the gas block manufacturer, below are the compatible gas block dimensions:

MAX gas block length: 1.00
MAX gas block height: 1.35

Known incompatible low profile gas blocks: Aero, Luth AR, and DPMS, and adjustable gas blocks.
5 Stars
No more cursing and throwing hammers
Can’t believe it took me so long to buy one of these tools. So far I’ve used it on about six different brand gas blocks including my favorite, the GBF, and it’s made effortless work out of them all. This tool is 100% worth it!
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from Tennessee. on 6/6/2020
5 Stars
This is a high quality tool. I'm glad to add add this to my gunsmithing collection. It would great if you guys made barrel dimpling tools.
Did you find this helpful?  4 of 4 Found Helpful
Reviewed by: (Verified Buyer)  from Albuquerque. on 5/20/2020
4 Stars
El Papa
Out of the box, it did not work with Aero Precision's Low Profile Adjustable Gas Block. I used a Dremel and a small file to widen the channel on the left of the punch pin hole.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Vallejo. on 1/10/2022
5 Stars
Third Hand
Great tool, universal bench blocks work ok but this tool is made for one purpose and one purpose only and thats low profile gas blocks. My SLR gas block fit perfect in this tool. Its like having a third hand.
Did you find this helpful? 
Reviewed by:  from Hatfield PA. on 4/22/2021

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