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Discussion Starter #1
ok so i have the paper work and the check all filled out. i put a few different barrel lengths so i will be able to build what i want when the stamp comes.

so im stuck between a 7.5 and a 10.25"-10.5"

any input would be great.

its just for fun BTW
and hopefully some day i will be able to get both but right now im stuck for just one
 

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I went with a 10.3" CMMG upper. I choose the 10.3" upper because that is what is generally excepted as the shortest you can go while still being able to stabalize a bullet for a suppressor.
 

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Discussion Starter #3
I went with a 10.3" CMMG upper. I choose the 10.3" upper because that is what is generally excepted as the shortest you can go while still being able to stabalize a bullet for a suppressor.
yes im more leaning twords the 10.25ish length. i hope to get a cmmg as that is what my lower is and what my ofther ar-15 is, its a 18" SPR

do you have a pic?
 

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HAHAHA I never get tired of posting it!



 

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Discussion Starter #5

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Most places won't warranty a suppressor that is shot on a barrel less than 10.5" (varies by mfr, 10.3" probably counts). That being said, I have a 7.5" and love it. I put another 100 rounds of trouble-free 223 through it on Friday. Besides costing me like $35 to shoot that ammo (Black Hills) I have absolutely no complaints.

If I really want a suppressor, I'll either go with an 11.5" barrel or just build another upper. :D
 

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Yeah, AAC goes as low as 10.3", so thats what I went with as I want to go with a M4-2000.

The handgaurd is a VLTOR CASV
 

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Discussion Starter #8
if i get a 223 can i will use it on my 18" SPR no sence takeing the risk especially if you have a short 1:9 twist. but personally i wouldnt shoot shorter then a 1:7 11.5 unless i know 100% i would be ok.
there is a web site i think its silencertests.com or somthing like that but he blows the guts out of his can but i think the barrel was 14.5 but i could be wrong but it was at least a 10+
ill go look for the link
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yup a 14.5" barrel and 62 grain ball gutted the hole thing.
you might need to create an account to see it but its the HTG universal that blew up

so after that i would be very careful about useing a can on a SBR i have a tac 65 22lr that i will use with it once i get a conversion or dedicated upper for 22lr but i would like a 223 can also
 

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The SWAT guys were I work shoot full auto through their 11.5" M4s without a single problem. They are using the M4-1000 and M4-2000 by AAC.
 

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Discussion Starter #10
The SWAT guys were I work shoot full auto through their 11.5" M4s without a single problem. They are using the M4-1000 and M4-2000 by AAC.
im sure plenty of people do, that was probably just one fluke. who knows
but still makes me nervous. but either way i dont see a 223 can in my future just yet. my next can if there is one will most likely be a 308
 

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when i did mine i went with 10.5 on the form and you can go as short as long as you want after so long as you have 10.5 to put back on it to bring it back to its original configuration that it was registered as,

also i did not go the route of listing different barrel lengths or calibers as i was advised by the guy who did my paperwork and trust that depending on the ATF agent assigned it could result in longer delays and could possible result in a rejection YMMV

if you go with one and want to change it permanently just notify the ATF of it in writing no further taxstamp needed.

also i chose the 10.5 as i had already decided on a LMT 10.5 upper. so whatever you decided to be your first upper on it is going to be go with that.
 

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i have a S&W ar 15 same as u so if i was to order the SBR 10.3 i would
just register my lower SN? and if i understood right i could put 10.3 on the form and i could also get a 7.5 and just have 1 stamp as long as i have the
10.3 upper to switch back too ... thanks for the info guys
 

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Discussion Starter #13
see they told me that i have to notify them for EVERY upper i have that wasnt listed on my paper work.
i called and talked to a person who then transfered me to a specialist
 

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Discussion Starter #14
hey did you guys write what you had engraved in 4 h. the spot where it says additinal info
 

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i have a S&W ar 15 same as u so if i was to order the SBR 10.3 i would
just register my lower SN? and if i understood right i could put 10.3 on the form and i could also get a 7.5 and just have 1 stamp as long as i have the
10.3 upper to switch back too ... thanks for the info guys

Since all you are registering is the lower and basically you are paying for a manufactures stamps IE you are the manufacturer making a smaller than legal length so long as you retain the parts to return it to the length listed on your form 1 there should not be any problems going to a 7.5" upper or going to a 16" upper

but then again when i filed for my stamp i did not actually own anything smaller than 16" since it could be a assumed that i had the parts for a SBR with no stamp.

its not recommended to own a short barreled upper unless you have a pistol lower or a Registered SBR lower the ATF does not play around.
 

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see they told me that i have to notify them for EVERY upper i have that wasnt listed on my paper work.
i called and talked to a person who then transfered me to a specialist
sounds like a trick question as yoiu should not have any length lower than 16" for a rifle if you do not have registered lower.
 

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I'd say 10.5 ish is ideal for a SBR.
 

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Discussion Starter #18
I'd say 10.5 ish is ideal for a SBR.
yea i think thats what im getting, i might in the future get a 7.5 but for now i think that i will get the 10.5
 

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Discussion Starter #19
sounds like a trick question as yoiu should not have any length lower than 16" for a rifle if you do not have registered lower.
i know that. my original post stated that i am registering my ar-15 lower.
i will buy it when and only when my stamp comes back
 
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