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1/25/2018 7:38:29 AM
Posted: 12/17/2005 12:10:11 PM EST
Do you measure from the "lug slots" where the bolt sits, or do you measure from the end of the chamber??

Link Posted: 12/17/2005 1:03:22 PM EST
[Last Edit: 12/17/2005 1:06:48 PM EST by 2manytoys]
Barrel length is measured from the breech to the muzzle. Lock a bolt into the breech end, make sure there is no removable muzzle device attatched, insert a dowel or rod into bore until it touches the bolt face. Mark a line on the rod at the muzzle, remove & measure.
Link Posted: 12/17/2005 11:01:15 PM EST
Barrel length is measured muzzle to breech face on any rifle or handgun.
For simplicity sake, on an AR-15 rifle, you can measure the complete barrel and subtract 3/8" as that's the nominal dimension from the breech face (bolt locked in battery in the barrel extension) to the rear of the barrel extension.

If you are shortening a barrel, just keep an extra 1/8" or so on there so there's no question about legality.
Most 16" barrels come from the manufacturer's at 16.25" length if you actually measure them...

Randall Rausch
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