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Posted: 6/21/2001 3:25:34 AM EDT
I have a Colt AR15 SP1 that I bought back in 1979. I plan to buy the preban Bushmaster upper that has the 11.5" barrel and 5.5" flash supressor.

If I do this, am I giving up too much velocity and accuracy? I think that I will mainly be shooting at 100 yds but I would still like to hit targets at 200 yds if needed.

I also plan to get a telescoping stock for it. Some people have mentioned that their rifle was less reliable after swapping in a telescoping stock. Is this something that I should be concerned about?
Link Posted: 6/21/2001 3:32:23 AM EDT
[#1]
If you aren't buildin' an SBR why get an 11.5 inch barrel when you need a 16" overall barrel lenght?

Why not get a 16" barrel with a flash suppresor? Or a 14.5 inch barrel with a flash supresor of at leat 1.5" permanantley affixed?

The velocity rule of thumb is appx 30 fps per inch IIRC. So you are losing 165 fps, appx.  
Link Posted: 6/21/2001 4:02:57 AM EDT
[#2]
11.5"barrel plus 5.5" FH is a perfectly legal upper to have on your preban as long as the flash hider is permanently attached.mmk
Link Posted: 6/21/2001 4:05:49 AM EDT
[#3]
MMK, I assumed he knew that and was staying legal. But why if you need 16" of barrel/perm flash supp, not get the most barrel out of that combo as possible? That was my point.
Link Posted: 6/21/2001 4:17:11 AM EDT
[#4]
Legally, you could have a 5" barrel with an 11" flash suppressor permanently affixed.  Whoo-hoo!  You'd have the "coolness" of a really big flash suppressor with the hard-hitting ballistics of a .22 Magnum.  [rolleyes]

The barrel is the heart of the rifle.  I'd keep it at least M4 length (14.5").
Link Posted: 6/21/2001 5:18:00 AM EDT
[#5]
Kin, you should be just fine.  This is not an unusual combination.  At 100 yards, you'll never notice the difference.  The shorter sight radius will have the most effect.

Norm
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