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Posted: 8/22/2006 7:36:49 AM EDT
I just finished my first NFA transfer (AAC Pilot) and have been bitten by the stamp collecting bug pretty badly.  Now I want a SBR.

I've got a lower, with a blank F1 in hand.  The question is, do I want a 7.5" or a 10.5" one?  The other question is .223/9mm, but I'm pretty dead set on .223.  

What are the benefits of each length?  Will a 10.5 do anything for me that a 7.5 doesnt do other than "be three inches longer"?  This is pretty much a range toy, but I'm leaning towards a 10.5 because its my understanding that the 7.5s dont run quite as well.  That being said, I'de like to have it as compact as possible.  I'm also eventually planning on adding a suppressor if that is a factor.  

Anyone have any advice for me?

Link Posted: 8/22/2006 8:48:28 AM EDT
I personally prefer the 10.3" cmmg uppers. They've always been plug and play. That said I have 3 uppers (love them all) and I'm selling 1 and building a 7.5" or SPR.

Once you buy 1 you want different combinations ready (sound suppressor, KX3, A2) each on a different upper.

10.3" 1/7 can still spin the rounds fast enough to make a good under 100 yard rifle defense rifle and the balance is incredible.

I started at 11.5" but didn't like that extra inch hanging out. 10.3" is my go to gun now but damn those 7.5" rifles look wicked fun. I think if you buy them built you shouldn't have any problems, the 7.5" Kitty Kat is like 700 bucks though OW. Awesome toy though.

Link Posted: 8/24/2006 4:39:42 PM EDT
I like the longest that my Suppessor is rated for. 7.5 inch will eat or can up faster, to much extra hot gases in the can= extra heat  
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