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Thread: 11.5" upper questions: Lightweight/Suppressor Use/BFH

  1. #11
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    Quote Originally Posted by rob_s View Post
    Is that just because they don't do an 11.5" N4? What made you choose SS?
    Well because they don't have an N4 11.5, and also because they do not sell N4 barrels separately........
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  2. #12
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    I didn't see this part answered, so I'll answer a couple. You can possess the upper as long as it's not mated to the lower, but there's a gray area there. It would be advised to not have an unused lower stored as well and what may be even better, is store it at a different location where there are no ARs present. I think it'll be easy though for some to say, "let's just see how it looks!" and there's an instant felony and not worth going to jail for.

    Now, you cannot just make a lower a pistol lower by adding the pistol receiver extension. It must be considered a pistol. I've never bothered with one so I don't know if you can have a standard lower changed to a pistol, so I can't speculate on that. It is as simple as walking into a shop that has one and buying the same as a handgun. Again, not worth it to me, but that's just opinion.

    When it comes to the barrels, I'd probably not go lightweight for that application and considering the abuse the shorter barrels can be exposed to, I'd most likely opt for cold hammer forged in this instance, for longevity. My LMT mk18 barrel is a heavier profile and though it's not light compared to my SR15's, it handles very well since I grip it near the end of the rail.

  3. #13
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    Quote Originally Posted by Eurodriver View Post

    3. Can I posess an 11.5" upper if I have it "mated" to a stripped lower? Does it have to have a "pistol" buffer tube on it to be a "pistol"? What about a complete lower with no stock body/buffer tube?


    Thanks guys.

    I am going this route, but with a 10.5". Nonetheless, there are some things to know- you cannot convert a rifle receiver to a pistol receiver. Additionally, the receiver must be ordered as an "other" or "pistol" receiver from the manufacturer. If it was ever assembled/registered as a rifle, then you have to wait until you have your tax stamp before slapping the upper on it.

    I am personally going to install a pistol buffer to CMA. I am not going to take chances with the ATF.

  4. #14
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    You can use ANY lower receiver if it was purchased as stripped. There is no "taking chances" with the BATFE and we have discussed this many of times.

    Quote Originally Posted by suhu View Post
    I am going this route, but with a 10.5". Nonetheless, there are some things to know- you cannot convert a rifle receiver to a pistol receiver. Additionally, the receiver must be ordered as an "other" or "pistol" receiver from the manufacturer. If it was ever assembled/registered as a rifle, then you have to wait until you have your tax stamp before slapping the upper on it.

    I am personally going to install a pistol buffer to CMA. I am not going to take chances with the ATF.



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  5. #15
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    A stripped lower as purchased can be built into any configuration. We have discussed this many times. Depending on what it was built into, you may or may not be able to change it.

    Quote Originally Posted by jonconsiglio View Post
    I didn't see this part answered, so I'll answer a couple. You can possess the upper as long as it's not mated to the lower, but there's a gray area there. It would be advised to not have an unused lower stored as well and what may be even better, is store it at a different location where there are no ARs present. I think it'll be easy though for some to say, "let's just see how it looks!" and there's an instant felony and not worth going to jail for.

    Now, you cannot just make a lower a pistol lower by adding the pistol receiver extension. It must be considered a pistol. I've never bothered with one so I don't know if you can have a standard lower changed to a pistol, so I can't speculate on that. It is as simple as walking into a shop that has one and buying the same as a handgun. Again, not worth it to me, but that's just opinion.

    When it comes to the barrels, I'd probably not go lightweight for that application and considering the abuse the shorter barrels can be exposed to, I'd most likely opt for cold hammer forged in this instance, for longevity. My LMT mk18 barrel is a heavier profile and though it's not light compared to my SR15's, it handles very well since I grip it near the end of the rail.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  6. #16
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    I hope I'm not derailing this thread, but I've had some questions in the back of my head for a while regarding suppressed SBR's and they seem to tie in with the OP's comments below.

    Quote Originally Posted by Eurodriver View Post
    ...buying an 11.5".... It will be suppressed 100% of the time and shoot no further than 200 yards. This will be run hard.

    4. I chose 11.5" because it combines the best in terms of length with reliability (as BCM said, it increases the overall length of the weapon only 4% while drastically increasing dwell time). However that doesn't mean other lengths are necessarily bad. Would 10.5" be better? 12.5"? A 10.5" bbl with the M4-2000 would equate to about a 17" overall.
    I'm aware of the reasoning for going with an 11.5" or 12.5" barrel over a 10.3" or 10.5" barrel with regards to dwell time, muzzle velocity, etc. However, if you're going to be running the rifle suppressed 100% of the time, is the attached suppressor a substitue for the lack of barrel length? Will the suppressor help make up for the decreased dwell time of a sub-11" barrel? Also, if running the rifle suppressed 100% of the time, is there any reason to use a suppressor that attaches to a brake rather than one that threads directly onto the barrel?
    Steve

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    Quote Originally Posted by SteveL View Post
    I hope I'm not derailing this thread, but I've had some questions in the back of my head for a while regarding suppressed SBR's and they seem to tie in with the OP's comments below.



    I'm aware of the reasoning for going with an 11.5" or 12.5" barrel over a 10.3" or 10.5" barrel with regards to dwell time, muzzle velocity, etc. However, if you're going to be running the rifle suppressed 100% of the time, is the attached suppressor a substitue for the lack of barrel length? Will the suppressor help make up for the decreased dwell time of a sub-11" barrel? Also, if running the rifle suppressed 100% of the time, is there any reason to use a suppressor that attaches to a brake rather than one that threads directly onto the barrel?
    I'm not the OP but I had jumped in on the bandwagon because he and I are in a similar place.

    I am waiting on the stamps for the barrel and the can, I am assuming the SBR will mostly be shot suppressed, but for me the advantage of the mount on the muzzle end is because I would still like to use the can on my 14.5" middy as well, and the AAC muzzle brake/mount also protects the inside of the can from the blast a short barrel provides.

    As for the effect of the can on the dwell time and what not, I have no answer there, but that is an interesting question.
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  8. #18
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    Quote Originally Posted by Fire_Medic View Post
    I'm not the OP but I had jumped in on the bandwagon because he and I are in a similar place.

    I am waiting on the stamps for the barrel and the can, I am assuming the SBR will mostly be shot suppressed, but for me the advantage of the mount on the muzzle end is because I would still like to use the can on my 14.5" middy as well, and the AAC muzzle brake/mount also protects the inside of the can from the blast a short barrel provides.

    As for the effect of the can on the dwell time and what not, I have no answer there, but that is an interesting question.
    I appreciate your comments. With regard to the bolded section above, I would have thought a can that threads directly onto the barrel would be designed to account for the blast and lack of a brake. I could be completely wrong though.

    I really hope someone can help us out with the dwell time questions I asked above.
    Steve

  9. #19
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    Quote Originally Posted by SteveL View Post
    I appreciate your comments. With regard to the bolded section above, I would have thought a can that threads directly onto the barrel would be designed to account for the blast and lack of a brake. I could be completely wrong though.

    I really hope someone can help us out with the dwell time questions I asked above.
    the information I have received is that the muzzle brake/mount protects the can better, more importantly the first baffle.

    And yes I also hope we get some input on the dwell time and how it might or might not be affected by a suppressor.
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  10. #20
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    Quote Originally Posted by Fire_Medic View Post
    the information I have received is that the muzzle brake/mount protects the can better, more importantly the first baffle.

    And yes I also hope we get some input on the dwell time and how it might or might not be affected by a suppressor.
    Do you mind if I ask where you got this information? I'm just curious because I'm just now starting to do research into SBR's and suppressors.
    Steve

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