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7/4/2025 8:17:59 AM EDT
I'd like to build an 11-13" barreled 308 upper. What barrels are guys using? How about handguards? For guys who have done it, did you build the upper from the ground up, or modify a factory upper?

Secondly, what is the compatibility between gen 2 and gen 3? I own a Gen 2 lower, and I believe two Gen 2 uppers. I think they're Gen 2, anyway. I'm not sure how to tell. Do Gen 3 uppers work on Gen 2 lowers? Do Gen 2 uppers work on Gen 3 lowers?

Thanks for any reply.

@PalmettoStateArmory
7/4/2025 9:56:12 AM EDT
[Last Edit: PalmettoStateArmory][Edited] [#1]
Originally Posted By ELittlefield:
I'd like to build an 11-13" barreled 308 upper. What barrels are guys using? How about handguards? For guys who have done it, did you build the upper from the ground up, or modify a factory upper?

Secondly, what is the compatibility between gen 2 and gen 3? I own a Gen 2 lower, and I believe two Gen 2 uppers. I think they're Gen 2, anyway. I'm not sure how to tell. Do Gen 3 uppers work on Gen 2 lowers? Do Gen 2 uppers work on Gen 3 lowers?

Thanks for any reply.

@PalmettoStateArmory
View Quote


Gen 2 and Gen 3 are compatible with each other. @d16MAN has experience with SBR'ing a PSA 308 and can probably give more info.

Thanks,

Josiah
Palmetto State Armory
3760 Fernandina Rd
Columbia, SC 29210
Web Sales: 1-803-724-6950
7/4/2025 10:08:48 AM EDT
[Last Edit: PalmettoStateArmory][Edited] [#2]
Quote History
Originally Posted By PalmettoStateArmory:


Gen 2 and Gen 3 are compatible with each other. @d16MAN has experience with SBR'ing a PSA 308 and can probably give more info.

Thanks,

Josiah
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Quote History
Originally Posted By PalmettoStateArmory:
Originally Posted By ELittlefield:
I'd like to build an 11-13" barreled 308 upper. What barrels are guys using? How about handguards? For guys who have done it, did you build the upper from the ground up, or modify a factory upper?

Secondly, what is the compatibility between gen 2 and gen 3? I own a Gen 2 lower, and I believe two Gen 2 uppers. I think they're Gen 2, anyway. I'm not sure how to tell. Do Gen 3 uppers work on Gen 2 lowers? Do Gen 2 uppers work on Gen 3 lowers?

Thanks for any reply.

@PalmettoStateArmory


Gen 2 and Gen 3 are compatible with each other. @d16MAN has experience with SBR'ing a PSA 308 and can probably give more info.

Thanks,

Josiah

Many thanks! You guys really are the best.
7/4/2025 10:11:07 AM EDT
[Last Edit: RDTCU][Edited] [#3]
I'm almost done with a large frame with a CMMG 12.5" midlength barrel.
Found on sale for $170.
7/4/2025 10:38:24 AM EDT
[#4]
Quote History
Originally Posted By RDTCU:
I'm almost done with a large frame with a CMMG 12.5" midlength barrel.
Found on sale for $170.
View Quote

How about a handguard?
12/25/2025 12:16:48 PM EDT
[#5]
Quote History
Originally Posted By RDTCU:
I'm almost done with a large frame with a CMMG 12.5" midlength barrel.
Found on sale for $170.
View Quote

@RDTCU any updates on this gun?
12/25/2025 12:34:57 PM EDT
[Last Edit: Ignorant][Edited] [#6]
I bought a complete 12.5" upper from km tactical, $350. I put an adjustable gas block on it, its pistol length gas. I put 60 rounds of ball ammo through it, ran great-just need to test accuracy and shoot the hell out of it...I plan to upgrade the barrel later so im interested in where this thread goes. It's sitting on a blem psa stealth p10 lower from the bf sale fyi. Like $60.
12/25/2025 9:22:24 PM EDT
[Last Edit: RDTCU][Edited] [#7]
Quote History
Originally Posted By ELittlefield:

@RDTCU any updates on this gun?
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Quote History
Originally Posted By ELittlefield:
Originally Posted By RDTCU:
I'm almost done with a large frame with a CMMG 12.5" midlength barrel.
Found on sale for $170.

@RDTCU any updates on this gun?

It's a sweet shooter, ignore the scope paint, will be swapping.
Riflespeed block, had to machine a custom handguard cap.
Barrel is fairly heavy profile, maybe one day I'll get it lightened or replace it with an $800 craddock barrel or something...
Attached File
12/25/2025 10:03:21 PM EDT
[#8]
Quote History
Originally Posted By RDTCU:

It's a sweet shooter, ignore the scope paint, will be swapping.
Riflespeed block, had to machine a custom handguard cap.
Barrel is fairly heavy profile, maybe one day I'll get it lightened or replace it with an $800 craddock barrel or something...
https://www.ar15.com/media/mediaFiles/173511/1000023204_jpg-3682177.JPG
View Quote View All Quotes
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Quote History
Originally Posted By RDTCU:
Originally Posted By ELittlefield:
Originally Posted By RDTCU:
I'm almost done with a large frame with a CMMG 12.5" midlength barrel.
Found on sale for $170.

@RDTCU any updates on this gun?

It's a sweet shooter, ignore the scope paint, will be swapping.
Riflespeed block, had to machine a custom handguard cap.
Barrel is fairly heavy profile, maybe one day I'll get it lightened or replace it with an $800 craddock barrel or something...
https://www.ar15.com/media/mediaFiles/173511/1000023204_jpg-3682177.JPG

Beautiful!
12/28/2025 6:40:22 PM EDT
[#9]
Not SBR length but I put a Wilson Combat SS 308 barrel on mine. Went from a 1.5-2 moa gun to a .75-1 moa gun. Checked headspace but used the same bolt.
12/28/2025 7:20:12 PM EDT
[#10]
Quote History
Originally Posted By nait86:
Not SBR length but I put a Wilson Combat SS 308 barrel on mine. Went from a 1.5-2 moa gun to a .75-1 moa gun. Checked headspace but used the same bolt.
View Quote

Now that's what I like to hear. Thank you!
12/29/2025 6:38:45 PM EDT
[#11]
Zero first hand experience with their .308 barrels and I haven't even gotten around to shooting the .300blk barreled upper I built, but Faxon makes a 13.9" DPMS pattern .308 barrel for $235.

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