AR15 barrel replacement -- easy, or difficult?

Walipala

New member
I was wondering if barrel replacement is typically a simple task on an AR15 for a mechanically inclined person. I've got an old, old upper receiver on my Colt SP-1. It's actually a GI surplus M16A1 upper and lord knows how many thousands of rounds have been fired through it. Its bore is actually looking a bit dull and pitted toward the muzzle. Might have spent some time in the jungle.

I would like to replace the barrel with one of the newer, M16A2 profile barrels (thin under the hand guard) with a tighter twist, like 1:9", which seems to be a standard, like the type sold by Bushmaster.

I'm sure a few tools would need to be purchased, like a barrel wrench at least, and maybe a jig of some kind for holding the receiver? Is removal and replacement usually a simple matter, or is there likely to be fitting/filing work needed?
 
Pretty easy. On a parallel with changing break pads on a car or so. Lots of detailed info at AR15.com. You will need a barrel nut wrench and either a barrel clamp or a device that holds the action (better choice) and a vice.
 
Thanks Hodaka. Yep, brakes, axles, etc. are no problem for me, or my Scout wouldn't run :) and it looks like Bushmaster sells some nice tools---wrenches, receiver holder---that are relatively inexpensive. I will take a look at ar15.com.

I guess I should have asked, is there any adjustment involved for head-spacing etc. with a new barrel, or should everything fit correctly as long as the barrel is torqued down correctly?
 
A cautious person would naturally check with a headspace gauge. With that said, I have installed 6 different barrels without checking with a gauge and have never had a problem. I think that the AR design, with the bolt engaging the barrel extension, sort of makes the bolt/barrel lock-up sort of fool-proof, but I may be wrong.
 
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