most imprtant AR parts,

[aiformula]

That long thingy above is kinda funny right from the start... You want a 4150 bbl then you destroy the metallurgy by chrome lining it. The chrome will not build up evenly all the way down the bbl and accuracy will suffer. Chrome is good if you intend to shoot nothing but corrosive milsurp ammo and are using it for a plinker. If you want tight groups, avoid the chrome lined. If you are gonna spring for the extra couple bucks for a stainless or 4150 bbl over a 4140 bbl, the last thing you want to do is chrome it. The only real difference in the alloys from a practical standpoint is the amount of carbon in the matrix which allows for slightly better wear characteristics when hardened, and a slightly higher through hardening capability which isn't even utilized when making gun bbl's. The hardest gun bbl I've ever come across was only about 30 on the Rockwell C scale which is right where a standard 4140 pre hardened blank will put you.

[rogerxd45]

Originally Posted by aiformula

That long thingy above is kinda funny right from the start... You want a 4150 bbl then you destroy the metallurgy by chrome lining it. The chrome will not build up evenly all the way down the bbl and accuracy will suffer. Chrome is good if you intend to shoot nothing but corrosive milsurp ammo and are using it for a plinker. If you want tight groups, avoid the chrome lined. If you are gonna spring for the extra couple bucks for a stainless or 4150 bbl over a 4140 bbl, the last thing you want to do is chrome it. The only real difference in the alloys from a practical standpoint is the amount of carbon in the matrix which allows for slightly better wear characteristics when hardened, and a slightly higher through hardening capability which isn't even utilized when making gun bbl's. The hardest gun bbl I've ever come across was only about 30 on the Rockwell C scale which is right where a standard 4140 pre hardened blank will put you.

once again dont take data from one area get it from several different places and make an educated choice from what you have learned

[mvician]

Originally Posted by devilslayer

funny how just snapping an upper and lower together saves you money..

you save on the tax the manufacture pays for a complete rifle, which in turn get passed to the consumer