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2/14/2021 6:52:42 PM EDT
[#1]
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Originally Posted By pezboytate:


If you aren't using a suppressor, it would probably be OK.

Someone might trade you their 13" for it.
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Yeah, I have a Sandman-S that would be going on it. I have a KeyMo NOX ready to go on it so I can use it.
10/12/2021 10:49:02 PM EDT
[#2]
way overthinking the problem if it's a free float tube.  buy what ever is for sure longer than you need and pick up a hacksaw at Ace....
1/29/2022 11:21:23 PM EDT
[#3]
Quote History
Originally Posted By terry_tr6:
way overthinking the problem if it's a free float tube.  buy what ever is for sure longer than you need and pick up a hacksaw at Ace....
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" We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm. " -George Orwell
Celer, Silens, Mortalitas
"Swift, Silent, Deadly"
1/24/2023 11:34:14 AM EDT
[#4]
Attached File
1/24/2023 11:36:11 AM EDT
[Last Edit: 5L33P3R][Edited] [#5]
Quote History


appreciate this,  work in progress waiting on barrel to show up and hunting down a 249f to replace the KAK clone that i have on hand
Attached File
4/18/2023 5:36:18 PM EDT
[#6]
Great info!
Change is the only constant. - Heractilus
1/8/2024 1:46:19 AM EDT
[#7]
So what size Free Float drop-in Rail for Colt 6920 and 6721??

Thanks
1/8/2024 4:14:45 PM EDT
[Last Edit: pezboytate][Edited] [#8]
Quote History
Originally Posted By Primecube:
So what size Free Float drop-in Rail for Colt 6920 and 6721??

Thanks
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Carbine length. There used to be rifle length rails with a cutout for the FSB that would fit them but I don't believe they are still made.
10/20/2024 4:55:41 PM EDT
[#9]
Quote History
Originally Posted By pezboytate:


Carbine length. There used to be rifle length rails with a cutout for the FSB that would fit them but I don't believe they are still made.
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Quote History
Originally Posted By pezboytate:
Originally Posted By Primecube:
So what size Free Float drop-in Rail for Colt 6920 and 6721??

Thanks


Carbine length. There used to be rifle length rails with a cutout for the FSB that would fit them but I don't believe they are still made.

Centurion has them in stock at this moment.

060912P
Let's get after it.
For the glory of the empire, so say we all.
I collect blank posts and use them
12/14/2025 3:28:23 PM EDT
[#10]
What's a 7.25 FF quad rail look like on a 9" barrel?

It seems most .300 BO Barrels are 7.5" or 9" for the short configurations but the rails I'm looking at are available in 7.25" or 9.25"

Appreciate the thread.
Greater love hath no man than this, that a man lay down his life for his friends. - John 15:13

The urge to save humanity is almost always only a false-face for the urge to rule it. - H.L. Mencken
12/14/2025 7:34:24 PM EDT
[#11]
Quote History
Originally Posted By 96Ag:
What's a 7.25 FF quad rail look like on a 9" barrel?

It seems most .300 BO Barrels are 7.5" or 9" for the short configurations but the rails I'm looking at are available in 7.25" or 9.25"

Appreciate the thread.
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That would definitely leave some barrel exposed. I'm not too familiar with 300 BLK barrels, but they probably don't measure exactly what they are advertised as.


I would look for an ~8" barrel to use with a carbine length handguard.
12/14/2025 10:49:15 PM EDT
[#12]
Quote History
Originally Posted By pezboytate:


That would definitely leave some barrel exposed. I'm not too familiar with 300 BLK barrels, but they probably don't measure exactly what they are advertised as.


I would look for an ~8" barrel to use with a carbine length handguard.
View Quote
Thank you.
Greater love hath no man than this, that a man lay down his life for his friends. - John 15:13

The urge to save humanity is almost always only a false-face for the urge to rule it. - H.L. Mencken
12/28/2025 11:57:30 AM EDT
[#13]
Do we have an actual measured rail length database out there somewhere?  If not, that would be good for crowdsourced information.  Nominal length ≠ actual length.
12/29/2025 9:43:29 AM EDT
[#14]
Excellent post. Manufactures should definitely provide accurate information as I too have dealt with issues caused by the “listed” length of a rail.
12/29/2025 10:51:17 AM EDT
[#15]
Originally Posted By heavyduty:
Do we have an actual measured rail length database out there somewhere?  If not, that would be good for crowdsourced information.  Nominal length ≠ actual length.
View Quote


Originally Posted By RollmarksMatter:
Excellent post. Manufactures should definitely provide accurate information as I too have dealt with issues caused by the “listed” length of a rail.
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A Google Sheet or something with self measured and verified lengths would be nice.

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