A barrel can run anywhere from $150 to $450.
Depends on what you want it for.
Do you want a plinker, or a match grade gun?
If you can be a little more specific, we can get a better $$$ idea on what your looking at.
A $150 barrel is a production piece that may shoot 1" 100 yd groups, but expect 2-2. 5" groups with decent ammo. Theyre NOT chrome lined. 16"
ESS Solutions, LLC - Home
Daniel Defense makes a good button rifled barrel that's chrome lined. It runs just under $200. It may be a little more accurate than the $150 barrel, but will out last the 150 barrel by about 2x's. 16" This is a good barrel for the $$$.
https://danieldefense.com/cold-hamm...mm-carbine-1-9-twist-cut-barrel-stripped.html
Daniel defense also makes cold hammer forged barrels. Theyre almost +$100 more than the $200 DD barrel.
https://danieldefense.com/cold-hamm...ls/16-5-56mm-carbine-chf-barrel-stripped.html
For $325 there's the Centurion arms cold hammer forged barrel. It's made from a M249 machine gun blank. It uses a stronger steel made for the abuse of the fully automatic 249 machine gun. It's more accurate then the 2 above barrels, will last 3X longer than the $200 barrel. You can run it hot and hard and it will live a long life. Some say it's comparable to a Noveske. They cost $400++ This is a 16" barrel. I have one and I have a Daniel defense m4. I like the Centurion better.
Hammer Forged Barrel
$350 you can get a Walther barrel. Good quality. If youre a good (expert classified) shooter, this will shoot as good as you can. this is a 20" barrel
Lothar Walther
A 16" walther is cheaper, but wont be as accurate as the 20". This is a match quality barrel.
Lothar Walther
$400-$425 Krieger. Match quality, cut rifled barrel. Many say it's the BEST! I dont think they make 16" barrels. This is a 20".
Lothar Walther
$425 I can get a mk12 barrel. This is the barrel that is used in the USGI Mk12 rifle. Not a clone, THE actual same barrel made on the same machines by the same people. It's 18" and is match quality. I can get 16" for the same price.
MK12 Barrel
A quality bolt carrier group is about $125
An upper is about $90-100
Gas tube & roll pin... . $15.
Gas block/front sight..... $30~ish. Depends on what you want. Adjustable gas block, standard? Badger (mk12) etc. etc.
Flash hider $ crush washer... $6
Carry handle/rear sight $50~ish
I dont think I forgot anything.
Some prices WILL go up soon, no matter who you buy from.