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5/4/2017 5:14:15 PM EDT
What is the best way to lock down an A2 fsb/gas block that is not taper pinned , but rather, uses set screws?

All my others use taper pins, so this is new territory for me.

Do I need to dimple the bbl? Loctite? Both?

I just dont want it getting knocked left/right off the gas port.

(I'm not overly ginger with my ARs). And I tend to be clumsy at times.

Eta: currently has set screws, 2 left side, 2 right side. Where the taper pins would normally be.

Pic below:
Attached File
5/4/2017 6:22:54 PM EDT
[#1]
do they go all the way through? have you taken one out to see. from the looks of the picture it appears the barrel is notched just like when the FSP it pinned except in this case screws were used instead of taper pins. if this is the case, you have nothing to worry about that i can see.
5/4/2017 6:30:50 PM EDT
[#2]
You should have some flats machined in the barrel for the screw to contact.  Four.  Behind the screw .   Perhaps with taper pin slots filled in if present.
I hope this helps.
5/4/2017 6:33:00 PM EDT
[#3]
Having flats milled into the barrel would be the best way to do it. I would at least do dimples bc without them even with loctite there stands the potential to rotate the fsb if you hit it hard enough. I grabbed an image off google not mine....
5/4/2017 6:36:48 PM EDT
[#4]
4 individual set screws, that thread up against the barrel.
5/4/2017 6:38:34 PM EDT
[#5]
Hell Tig, send me the barrel and the FSB, I will drill and taper ream install the pins and send it back to you, I have the complete set up to do those in about 20 minutes.
5/4/2017 6:38:38 PM EDT
[#6]
Quote History
Quoted:
Having flats milled into the barrel would be the best way to do it. I would at least do dimples bc without them even with loctite there stands the potential to rotate the fsb if you hit it hard enough. I grabbed an image off google not mine....
http://i230.photobucket.com/albums/ee270/speedstar13/IMG_1557.jpg
View Quote
This is what I was imagining as ideal.

Any suggestions on marking the barrel in order to machine the flats?
5/4/2017 6:40:13 PM EDT
[#7]
Quote History
Quoted:
You should have some flats machined in the barrel for the screw to contact.  Four.  Behind the screw .   Perhaps with taper pin slots filled in if present.
I hope this helps.
View Quote
It does. Thank you.
5/4/2017 7:10:36 PM EDT
[#8]
Quote History
Quoted:
Hell Tig, send me the barrel and the FSB, I will drill and taper ream install the pins and send it back to you, I have the complete set up to do those in about 20 minutes.
View Quote
I may take you up on that Dave
5/4/2017 8:56:49 PM EDT
[#9]
Quote History
Quoted:
Hell Tig, send me the barrel and the FSB, I will drill and taper ream install the pins and send it back to you, I have the complete set up to do those in about 20 minutes.
View Quote
By far the best option yet. If not, as suggested mill the four flats and use threadlocker.
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