Using a trigger guard pin to pin a lo-pro gas block

[tim808]

Got a used BA barrel and BA lo-pro gas block and need to get a pin, to pin it to the barrel.

Read that the BA gb uses a 1/8” roll pin that is the same size as the trigger guard roll pin.

Before I try to find my spare trigger guard pin to check if it will fit, I tried to google if anyone used a trigger guard pin for their gb. My Google Fu came up with nothing.

Is a roll pin for the trigger guard okay for use with a gb? Or is a gb pin different to better handle the heat/temp?

If different, I’ll order a pin from BA.

(I could call BA but based on one person’s experience with BA, Ill get the correct answer here)

Tnx in advance!

[markm]

As long as you ream the hole to wear the pin stays, It'll be fine. I have some Adco abomination that has a role pin holding the block, and It's been fine.

[alx01]

probably will not work. There are two types of pins often called roll pins - one is a c-spring pin like on the trigger guard, the other type is a coil spring (similar to a Geissele Super Gas block).
Gas blocks from what I've seen are held in place by a coil spring. Size-wise it might work. It might even hold for a long time. But I don't think that would be 100% reliable for this purpose.

[markm]

I think you're right. I've seen the Geissele coil spring. I think my Adco just has a plain roll pin.

[tim808]

I read about coil pins and taper pins....was wondering about that. The guy that mentioned a roll pin might have been using a coil pin but used the wrong terminology.

I’ll try to see if the tg pin fits out of curiosity and double check with BA

The barrel is for a range toy - not home use - so it doesn’t have to be 100% but it would really suck if my toy went down at the range. I’m neutered and only get 1 pass each month

Tnx!

[Clint]

You could always just do it right and pick up a BRT Gas Block Pin Kit - Coil Pin (http://www.blackrivertactical.com/concrete5/store/#!/BRT-Gas-Block-Pin-Kit-Coil-Pin/p/35776609/category=6464008)

https://dqzrr9k4bjpzk.cloudfront.net/images/812059/294749816.jpg

[alx01]

Taper pins are solid pins used for FSB installation:
Use this: https://www.bravocompanyusa.com/BCM-Taper-Pins-for-Front-Sight-Base-AR15-M16-M4-p/taper%20pins%20fsb%202.htm
To install this: https://www.bravocompanyusa.com/AR15-Front-Sight-F-Marked-p/front-sight-base-f-750.htm
(need a reamer as well to install taper pins)

I can't recall where or what manufacturer, but I have seen a picture online of a solid pin (one, not two) being used for a low profile gas block as well.

[26 Inf]

Got a used BA barrel and BA lo-pro gas block and need to get a pin, to pin it to the barrel.

Read that the BA gb uses a 1/8” roll pin that is the same size as the trigger guard roll pin.

Before I try to find my spare trigger guard pin to check if it will fit, I tried to google if anyone used a trigger guard pin for their gb. My Google Fu came up with nothing.

Is a roll pin for the trigger guard okay for use with a gb? Or is a gb pin different to better handle the heat/temp?

If different, I’ll order a pin from BA.

(I could call BA but based on one person’s experience with BA, Ill get the correct answer here)

Tnx in advance!

I think either would work. A slotted roll pin is not the wrong pin for the application, though.

The slotted spring/roll pin is best for situations with a static load, the coiled spring/roll pin is best for situations with a dynamic load. https://www.spirol.com/library/whitepapers/Pins_To_Max_Assembly_Life.pdf

The gas block application would be more of a static load.

[tim808]

26 inf - Tnx for the info the different types of pins!

I agree the roll pin will work but I noticed that the gas block makers include a coil pin...so I’ll go with a coil for peace of mind....and to support BRT :-)