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Posted: 12/10/2013 7:32:44 PM EST
Ok, so here's where I am... I have a 9mm Spikes AR and I'm going to build a short upper for it... I am torn on doing a 10.5 with the FSB or going 5" or so and doing the 9" rail (suppressor attached).. This will be a suppressed upper 99% of the time. My main concern is keeping rounds subsonic. I looked at the ballistics by length website, but those numbers just don't seem quite right on a few rds/lengths.

Looking for some first hand experience from someone with a 5"+/- and a 10.5 on rounds staying subsonic. I'd be shooting 147gr subs as that's all I can really consistently find reasonably priced. I also have a decent stash of the new Federal 124gr suppressor rounds.
Link Posted: 12/10/2013 8:35:05 PM EST
5" will generally keep everything subsonic and, when you add the length of your can, results in a rifle that is still compact.

Again, generally speaking, in 9" the heaviest (>147) projos might remain subsonic; subsonic ammo to be certain.
Link Posted: 12/10/2013 8:41:26 PM EST
I have been looking around the past hour or so and I think I'm going to order a GM 10.5 barrel and ship it to Adco to cut to 5" and thread 1/2x28 then run a 9" rail which should put my Tirant about 2.5 inches out of the rail
Link Posted: 12/11/2013 2:35:56 AM EST
ADCO has 5 in barrels 1/2x28 or sale on their website for $160.
Link Posted: 12/11/2013 3:46:37 AM EST
i got their 4.5" barrel... it looks awesome (not done building it yet) and it was shipped fast!
Link Posted: 12/11/2013 4:34:47 AM EST
From what I have heard, they use the left over pieces from when they cut someone else's barrel to make them into new barrels. Hearing this has kind of steered me from getting one of theirs as I really have no idea of the origin or round count
Link Posted: 12/11/2013 5:57:44 AM EST
[Last Edit: 12/11/2013 5:58:12 AM EST by eodinert]
....
Link Posted: 12/11/2013 6:32:35 AM EST
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Originally Posted By GunsNJax:
From what I have heard, they use the left over pieces from when they cut someone else's barrel to make them into new barrels. Hearing this has kind of steered me from getting one of theirs as I really have no idea of the origin or round count
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And how exactly would they do this? When people have their barrels cut down, they generally want to keep the end with the chamber....

Back on topic - I've got a 5" TROSUSA barrel that love; I've never had a 147gn round go supersonic through it.

-bob
Link Posted: 12/11/2013 6:34:30 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Bob_L:


And how exactly would they do this? When people have their barrels cut down, they generally want to keep the end with the chamber....

Back on topic - I've got a 5" TROSUSA barrel that love; I've never had a 147gn round go supersonic through it.

-bob
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Bob_L:
Originally Posted By GunsNJax:
From what I have heard, they use the left over pieces from when they cut someone else's barrel to make them into new barrels. Hearing this has kind of steered me from getting one of theirs as I really have no idea of the origin or round count


And how exactly would they do this? When people have their barrels cut down, they generally want to keep the end with the chamber....

Back on topic - I've got a 5" TROSUSA barrel that love; I've never had a 147gn round go supersonic through it.

-bob


Adco installs barrel extensions in house. The cut portion is basically a "blank"
Link Posted: 12/11/2013 6:41:34 AM EST
[Last Edit: 12/11/2013 6:42:32 AM EST by GreenM4Guy]
Link Posted: 12/11/2013 6:59:11 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By GreenM4Guy:
all of our barrels are made from blanks, not cutoff pieces. If you look closely at them, they are one solid piece not a screwed on extension.
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That is great to know and I'll for sure give them a closer look. There was a thread from one of your "regular walk in" customers that posted a pic of one he had that still had the cut where a FSB was installed and said you guys used the left over pieces from previous cuts. What's the twist on your barrels?
Link Posted: 12/11/2013 9:28:24 AM EST
[Last Edit: 12/11/2013 9:28:37 AM EST by GreenM4Guy]
Link Posted: 12/11/2013 2:01:40 PM EST
Fwiw I never had a 147 go supersonic out of my 10.5.

That said I'm about to go 7.3 for more compactness.
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