In building my own rifle from scratch, when I order a barrel with the front sight, what extra parts say from like J&T would I need to get with it aside from the delta ring assembly?

Also, If im building a M4 profile barrel assembly (14.5) will the CAR length gas tube work or will I need to cut it down? I havent actually seen anyone selling "m4" length gas tubes.

You'll need a delta ring, weld spring, and handguard snap ring IF your barrel assembly does not come with them -- many do.

M4 barrels use CAR gas tubes.

Chrome lining is an option some of there barrels, and so you may want to check and see if the barrel you are ordering is lined.  If not, make sure to upgrade to a lined barrel.

Also, J&T is prety good about breaking/pulling parts out of there kits.  Depending what you may want different than a stock kit, check with them on pulling parts/cost of the items to get the best overall build deal.

The last kit I ordered I used a RRA lower/upper receiver that I had on hand, and had them pull the stripped upper receiver out of their package to save me overall build costs.

Aw jewz Dano, you just had to start this bru-ha-ha all over again.  Along with the chrome lined barrel, don't forget the titanium firing pin and the nitrited bolt carrrier.  And please don't forget the ruby lazer sight that goes so well with the other bling-bling.  Of course, without your tango down with matching mag pulls you are sure to be TU.  Can't have the poseurs think you are not ready for the catwalk.

Or you can just build the rilfe and learn to shoot it properly, with skill and ability.  Know how to maintain it and feed it.  However, if you insist on the first route, save yourself some money and get an airsoft version.

Dude, the chrome lined barrel is a viable options, especially when he learns to bump the rifle.

As for the rest of the poser items you listed, not even on a bet will you every see them in any rifles I own.

Chrome-lining is a must on any rifle barrel I get from here on out.

They clean up so much easier.

WIZZO

Chrome lined is also nice in very humid climates (like where I live), but has the drawback of lesser accuracy.