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1/23/2014 7:04:57 AM EDT
I know this is a silly question but I honestly couldn't find the answer in searching.

When you are looking at barrel lengths and they are saying 7.5/10.5/14.5 etc.
Is that the measurement that is sticking out past the barrel nut? Or does that measurement include the extension and feed ramps that go inside the receiver?

I am asking mostly so I can make sure I get the right length of handguard, I don't want a tone of barrel sticking out but I also don't want the tip of the muzzle break inside the handguard either.

If I have a 9" handguard, will a 10.5 barrel will the comp/break still stick out the front an inch or so?
1/23/2014 7:23:12 AM EDT
[#1]
Barrel measurement is made with the bolt closed and any removable comp or brake removed.  Drop a rod to the chamber face, and mark where it exits the muzzle, pull the rod and measure.
1/23/2014 11:46:07 AM EDT
[#2]
Measurement is take from the bolt face which is about 5/8"s inside the upper.  Most barrels are 1/8" longer than whatever the manufactor specifies (altough some are up to 1/2").  So for practical purposes a 10.5" barrel would come to the end of a 10" handguard, a 11.5" barrel would extend 1" past a 10" handguard, etc.
1/31/2014 9:36:25 PM EDT
[#3]
As a rule of thumb you want a handguard that is nominally at least 1" shorter than the barrel it goes on. The usual is a 9" on a 10.5 barrel, 10" on an 11.5" etc. That gives you a little room actually but that's the lengths that barrels and handguards come in.
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