What other caliber to SBR?

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QuietMike
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Re: What other caliber to SBR?

Post by QuietMike » Wed Jun 22, 2016 10:13 am

50 Beowulf would be a fun, but expensive to feed, SBR.

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Re: What other caliber to SBR?

Post by golfindia » Wed Jun 22, 2016 10:17 am

I wouldn't SBR a standard AR lower as a 9mm, since you can take the mag adapter out if you want to.

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Re: What other caliber to SBR?

Post by IMGrunt » Wed Jun 22, 2016 10:24 am

Taking the mag adapter out is even more reason to SBR a standard lower in my way of thinking. Ability to use multiple uppers instead of just one 9mm upper if you go with a 9mm specific lower.
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Re: What other caliber to SBR?

Post by keith13b » Wed Jun 22, 2016 12:28 pm

idaho.jon wrote:I love my 9mm ar pistol, but mostly because it takes glock mags haha. I've always thought a Grendel would be fun in a 10-12" barrel.
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Re: What other caliber to SBR?

Post by DoubleJ » Wed Jun 22, 2016 7:10 pm

TMD wrote:
DoubleJ wrote:.458 SOCOM is pretty efficient in 12" barrel lengths due to the large bore and fast powders used. +1 for 9mm, also efficient and way cheap to shoot.

But quite a bit more $ to build.

Good point, and you almost need a dedicated 9mm lower, I think there might be one kit that allows you to remove the block from the magwell.
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Re: What other caliber to SBR?

Post by realtreehunter » Wed Jun 22, 2016 7:49 pm

9mm does sound fun, but I was under the impression you had to have a special 9mm lower.

To be honest, I hadn't even thought to look to see what the lower is stamped as.

I thought about just building it as a 223 or 556 but I'm not sure I want an SBR in that caliber and as I understand the rules I would be required to build the upper to match what I had it registered as so that I could get it back to its original configuration in case the ATF asks.

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Re: What other caliber to SBR?

Post by realtreehunter » Wed Jun 22, 2016 9:15 pm

DoubleJ wrote:
TMD wrote:
DoubleJ wrote:.458 SOCOM is pretty efficient in 12" barrel lengths due to the large bore and fast powders used. +1 for 9mm, also efficient and way cheap to shoot.

But quite a bit more $ to build.

Good point, and you almost need a dedicated 9mm lower, I think there might be one kit that allows you to remove the block from the magwell.
Are most mag blocks permanent after installation?

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Re: What other caliber to SBR?

Post by golfindia » Wed Jun 22, 2016 9:27 pm

Most mag blocks go in from the top, so you have to remove the bolt catch. If you have a lower that's got a set screw bolt catch, its not bad. Punching out the roll pin if you want to remove it is a pain though. Most of the good mag adapters cost as much if not more than a dedicated lower now days

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Re: What other caliber to SBR?

Post by farm use » Thu Jun 23, 2016 9:45 am

If you did a 9mm sbr build you would probably want a dedicated lower. But they are a lot of fun. I have a few SBRs, and thought I would only build one. One is a 12" Grendel, believe it or not its a awesome round for short barrel. Most think as I did before that the grendel is only for long barrels, ITS NOT. I have a 18" grendel also, and im not really losing much in 6". Iv taking it out to 600 yrds pretty easy and im sure it will go further.

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Re: What other caliber to SBR?

Post by tXr » Thu Jun 23, 2016 9:55 am

If I was to do a 9mm I think I would do one of these 80% lowers from NFA, https://newfrontierarmory.com/shop/c-9- ... tyle-mags/ uses Glock mags.
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