You can add a modernized A1 profile barrel for $199. Lightweight profile (pencil), chrome lined, 1:7 twist, M4 ramps, 20". Its not the military A2 barrel, buts its close enough, and lighter.
These are overruns, for a foreign contract. McKay says they don't know if any more will be available after these are sold as the contract is thinning out. Last year they had a batch. Its hard to find any 20" lightweight profile barrel. I don't think there would be a need for a government profile on a semi-auto. The only difference between the government and lightweight profile, if the government profile is thicker past the gas block, where extra metal is least needed. The markings on the image appear to be Colt markings. McKay isn't allowed say who makes them.
You'll need a gunsmith to add a front sight/block. I don't think anyone has been selling lightweight profile barrels for a long time, in stock anyway.
If not, BCM is selling a 20" government profile barrel for $239 (no front sight/block either). Fulton Armory sells what they call a match pencil barrel. That was recently out of stock for a long, long time, and that is $275.
http://store.mckay-ent.com/ar15-m16/m16-a1-replacement-barrel.html
M16 A1 Replacement Barrel
Part #: RM16A1-Barrel
Replacement barrel for M16 A1, new manufacture. Just released from prime military contractor. Perfect for finishing your M16 build project.
- Grey phosphate finish
- 20 inch length
- 0.625" diameter for gas block
- A1 "pencil" profile
- 1 in 7 twist
- Caliber 5.56 NATO
- Chrome lined
- With gas hole and barrel extension.
- Not pre-drilled for front sight tree taper pins
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