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11/24/2017 4:44:23 PM
11/22/2017 10:05:29 PM
Posted: 10/7/2004 9:39:25 AM EST
I'm building an 11.5" upper for a registered SBR and I've reached a small dillema:

1) I could build the upper with a 1:9 twist fluted bbl or

2) I could build the upper with a 1:7 twist non-fluted bbl

The 1:9 twist bbl is about $100 more than the 1:7 twist. Are there any advantages to having a fast twist on a bbl this short? Is there much advantage to the fluting?

What do you guys think?
Link Posted: 10/7/2004 10:20:08 AM EST
AFAIK with a shorter barrel a faster twist will give you more revolution=stability before the projectile exits the barrel, so I would go 1/7, as long as you don't mind using 55gr, 62gr or heavier bullets. 1/7 really doesn't work with 45gr at all.
Link Posted: 10/7/2004 10:23:09 AM EST
1:7

go with a barrell so lightweight you wont have enough metal to flute it!
Link Posted: 10/7/2004 10:53:04 AM EST
get the 1:7... on an SPR its a no brainer
Link Posted: 10/7/2004 1:22:14 PM EST
+3

Fluting on a short barrel is silly, IMO, unless you plan on doing so much heavy shooting in very hot conditions you will need the marginal extra cooling it provides by its extra surface area, but if that were the case you'd be part of a fire team, wouldn't you?
Link Posted: 10/7/2004 1:27:52 PM EST
1:7
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