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Posted: 10/11/2018 8:58:49 PM EDT
I was wondering if anyone has put in F mart gas block front sight on a 10.5 inch 300 blackout barrel? I have a 10.5556 with the F marked and I would like to clone it in the black out
Link Posted: 10/11/2018 9:11:19 PM EDT
[#1]
I have one but because i bought a worthless barrel from Givati company.  It is a 10.5 with pistol gas which you couldnt open the gas port big enough to run.  I drilled a new pistol gas port and used a low profile gas block under the handguard.  Kino configuration i think its called.  Point being you arent likely to find a 10.5 carbine with fsb because it wont run well.
Link Posted: 10/11/2018 10:57:35 PM EDT
[#2]
The kino is carbine and i want pistol
Link Posted: 10/12/2018 7:09:51 AM EDT
[#3]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The kino is carbine and i want pistol
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That was my point.  I got lucky to buy a carbine fsb gassed barrel that wouldnt run from a shady seller because they wont.  I drilled my own pistol gas port and installed low pro adjustable gas under the handguard.  You arent likely to find the barrel i found because they wont run.  You will need to talk to ballistic advantage or adco for someone that can make you the setup i have.
Link Posted: 10/12/2018 7:20:53 AM EDT
[#4]
See this photo.  I plugged the carbine fsb.Attachment Attached File

My m4 clamshell handguards fit over this.  Achieves what you want, a running 300 blk with carbine fsb while actually running because of the pistol gas system.
Link Posted: 10/12/2018 7:34:02 AM EDT
[#5]
I also opened the carbine gas port up to the max effective, .125 if i recall, and the carbine fsb still wouldnt cycle with subs but woukd with supers.  Just trying to save you all of the r&d I had to do because of a poor quality seller.

I stepped up from .065 until i found what i liked on the pistol gas.  I f you want i will try and dig up what i ended up with that cycled subs without a can.
Link Posted: 10/12/2018 7:49:31 AM EDT
[#6]
Perfect thx! I’ll get a pistol barrel, and put the fsb on done!
Link Posted: 10/12/2018 9:06:38 AM EDT
[#7]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Perfect thx! I’ll get a pistol barrel, and put the fsb on done!
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That should work!  If you think about it post back up here wheb its done so it will be archived for others.  We cant be the only "old-fashioned" folks that like our FSB.
Link Posted: 10/12/2018 1:16:20 PM EDT
[#8]
Yes - after running tubes for so long retro is apealing to me-
Link Posted: 10/14/2018 10:47:26 PM EDT
[#9]
Would magpul MOE clam shell fit over thst GB?
Link Posted: 10/15/2018 5:47:23 PM EDT
[#10]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Would magpul MOE clam shell fit over thst GB?
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You know I don't have one on hand to check, have skinny carbine and m4 fat guards.  I can measure the gas block dimensions for you if that helps?  Can also try the skinny handguards and see how they fit--let me do that and post back.
Link Posted: 10/15/2018 6:02:57 PM EDT
[#11]
gas block is 1.370 tall
With the "skinny" DMPS retro carbine handguard the heat shield just touch the gas block, enough it goes on but does make contact.  
The M4 "fat" handguards I would estimate .075" or so of clearance to the gas block I have.

Hope this helps.
Link Posted: 10/15/2018 9:31:38 PM EDT
[#12]
Perfect thx ! I got ut all planned out.
Link Posted: 10/16/2018 7:02:20 AM EDT
[#13]
Quoted:
I was wondering if anyone has put in F mart gas block front sight on a 10.5 inch 300 blackout barrel? I have a 10.5556 with the F marked and I would like to clone it in the black out
View Quote
Same here.  Very hard to find.
Link Posted: 10/20/2018 7:44:35 PM EDT
[#14]
CMMG makes a 12.5" 300BLK barrel with a .750 lo-pro gas block and pinned “F” marked front sight base. Perhaps they would make a 10.5" barrel.
Link Posted: 11/12/2018 11:39:58 PM EDT
[#15]
Link Posted: 11/12/2018 11:41:47 PM EDT
[#16]
Done -300blk

Link Posted: 11/13/2018 8:02:44 AM EDT
[#17]
Very nice!
Link Posted: 12/22/2018 8:47:37 AM EDT
[#18]
how does it run?
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AR Sponsor: bravocompany
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