SBR Questions

[pwoolford]

It could be done something like this. Smallest tube would be the size of the buffer tube but the inside diameter of the stock would match the largest tube. It could be made so one tube at a time comes out and locks into place in 2" or so increments.

That is genius!

 

[Pinecone]

Hmm, 20" long stock = 9" receiver/barrel combo.

Really, it should not be hard to make a longer buffer tube. Stock would not collapse quite as far.

Add 2" to buffer tube, you can get down a 8.5" barrel.

 

[SWO Daddy]

You dont even need any of that. Just make an extra length butt pad to give you the extra LOP needed while shooting in the state of Maryland.

 

[Hawkeye]

Add 2" to buffer tube, you can get down a 8.5" barrel.

I've been having thoughts in this direction lately also.

I'm in the middle of building a couple of AR pistols, which I have two requirements for: that they be easily suppressible, and that I may eventually want to SBR them. One will be 5.56, and the other .300BLK. The suppressible thing means that I'll likely do a 10.5" bbl on the 5.56 one, which means it will also easily meet the 29" OAL thing for MD SBRs. The .300 one, though... that round was designed for a shorter barrel, and you can easily suppress them out of 8.5" barrels.

So now my quest is to figure out if there is a way to get an AR with an 8.5" barrel to 29" OAL (without a permanent muzzle device, because I don't want to give up that flexibility) without getting silly.

It sounds like the VLTOR A5 seven position tube is about .75" longer than a standard carbine tube. That means I'd need about another 1.25" to get to 29" OAL easily. I've considered an extended buttpad, but I don't know who makes them and for which stocks.

What I'm considering now is to pick a stock (likely a VLTOR one, I love the eMod on one of my rifles) and figure out how to make myself a buttpad spacer that I can install between the buttpad and the stock. This will add some length to the whole setup, and wouldn't be any more easily removable than the buttpad itself would be, so it would be "legally" measurable, right?

Has anyone else gone down this road before? Am I retreading stuff that others have already done?

I know it's "easily" done with a 10.5" barrel. I just don't want to.

 

[Hawkeye]

You dont even need any of that. Just make an extra length butt pad to give you the extra LOP needed while shooting in the state of Maryland.

Haha.

You posted that between when I hit "reply" and during the 20 minutes I took to research stuff before I posted.

 

[protegeV]

Saw a error in my thinking charging handle . That would have to be modified or it would have to go underneath.



similar idea but if the smallest tube doesn't fit the stock how would you lock the stock to the smallest tube ?

Each tube would have to lock into the smaller one inside it somehow.so no matter what position you have it in, it will be locked in place.
Also, it would have to made of some seriously strong stuff to maintain strength when extended.

 

[protegeV]

That is genius!

Thanks

Lots of ideas, but no real way to turn them into reality.

 

[protegeV]

You dont even need any of that. Just make an extra length butt pad to give you the extra LOP needed while shooting in the state of Maryland.

I only shoot in MD and my arms are short. I don't need any extra LOP....

 

[dontpanic]

I've been having thoughts in this direction lately also.

I'm in the middle of building a couple of AR pistols, which I have two requirements for: that they be easily suppressible, and that I may eventually want to SBR them. One will be 5.56, and the other .300BLK. The suppressible thing means that I'll likely do a 10.5" bbl on the 5.56 one, which means it will also easily meet the 29" OAL thing for MD SBRs. The .300 one, though... that round was designed for a shorter barrel, and you can easily suppress them out of 8.5" barrels.

So now my quest is to figure out if there is a way to get an AR with an 8.5" barrel to 29" OAL (without a permanent muzzle device, because I don't want to give up that flexibility) without getting silly.

It sounds like the VLTOR A5 seven position tube is about .75" longer than a standard carbine tube. That means I'd need about another 1.25" to get to 29" OAL easily. I've considered an extended buttpad, but I don't know who makes them and for which stocks.

What I'm considering now is to pick a stock (likely a VLTOR one, I love the eMod on one of my rifles) and figure out how to make myself a buttpad spacer that I can install between the buttpad and the stock. This will add some length to the whole setup, and wouldn't be any more easily removable than the buttpad itself would be, so it would be "legally" measurable, right?

Has anyone else gone down this road before? Am I retreading stuff that others have already done?

I know it's "easily" done with a 10.5" barrel. I just don't want to.

The Law folding stock adapter will add about 1" to the OAL. Pretty expensive 1" though.

http://www.brownells.com/rifle-parts/stock-parts/buttstocks/ar-15-m16-gen3-m-folding-stock-adapter-prod71553.aspx

 

[Hawkeye]

The Law folding stock adapter will add about 1" to the OAL. Pretty expensive 1" though.

http://www.brownells.com/rifle-parts/stock-parts/buttstocks/ar-15-m16-gen3-m-folding-stock-adapter-prod71553.aspx

Yeah, and I don't know that I need it to fold.

I found this DPMS stock extension at Brownell's just now though. It says it adds an inch. Anyone have experience with these? One of these, plus a VLTOR 7 position A5 tube would give 1.75" added length. That's getting close.

 

[dontpanic]

Yeah, and I don't know that I need it to fold.

I found this DPMS stock extension at Brownell's just now though. It says it adds an inch. Anyone have experience with these? One of these, plus a VLTOR 7 position A5 tube would give 1.75" added length. That's getting close.

That's pretty cool. I wonder if you could stack 2 of those.

 

[Hawkeye]

That's pretty cool. I wonder if you could stack 2 of those.

I need to look at this a little closer, because there are some things out there that say they will work on an A1 or A2 rifle tube but not a carbine tube. It also appears that they wouldn't help add OAL for a collapsible stock stock (which are measured fully open), they just make fixed stocks have a longer LOP by bumping the fixed stock further out on the buffer tube.

That's out the window I think.

I'm back to thinking about either an extended buttpad or a spacer you could put between the buttpad and the stock itself.

 

[frogman68]

Thanks

Lots of ideas, but no real way to turn them into reality.

just thought of another one get two buffer tubes and weld them together cut the threads off the one end and seal it or thread a cap on it for storage. Going to try that

 

[Biggfoot44]

ACE Ltd's M4 SOCOM "Long Version" . The Long Version starts with 9.5in , and extends to 11.5in.

 

[frogman68]

ACE Ltd's M4 SOCOM "Long Version" . The Long Version starts with 9.5in , and extends to 11.5in.

I need 13 inches though


that sounds bad

 

[screamingeagle]

Vltor extended buffer tube and stock should get you there with Magpul thickest buttpad

 

[rayrevolver]

Magpul ACS or ACS-L + Vltor A5 should get you close if not there. You can then get a Magpul butt plate if you need a little more.

 

[outrider58]

You are only as strong as your weakest link. I'm not liking any of this...just for a couple inches??

 

[Hawkeye]

You are only as strong as your weakest link. I'm not liking any of this...just for a couple inches??

Not sure what you mean there?

The VLTOR tube and or all the other pieces we are talking about are quality stuff.

Personally, I'd rather have the rifle built with the barrel length that the round was designed for in the first place. Plus, with a collapsible stock, you don't have to run it all the way extended, so you end up with all the benefits of a shorter SBR overall while still remaining MD legal.

 

[outrider58]

Not sure what you mean there?

The VLTOR tube and or all the other pieces we are talking about are quality stuff.

Personally, I'd rather have the rifle built with the barrel length that the round was designed for in the first place. Plus, with a collapsible stock, you don't have to run it all the way extended, so you end up with all the benefits of a shorter SBR overall while still remaining MD legal.

Sorry. Not talking about that. More so talking about the silly telescoping tube theory. I understand the desire for shorter barrels in 9mm and 300blk but, 5.56...no need to go shorter than 10.5/11.5. Just no need, either way IMO. I do understand a lot of this is bucking the Md mandate and all...