What should I upgrade on my Colt to make it run naturally better?

[Siggy]

I have a Colt m4 6921 with zero problems. I do; however, want to change the parts that might fail with better ones. I have been told that some company in Texas makes a buffer tube spring that lasts forever and replaces the cheapy factory piece.

What else can I change to make this thing run naturally better with parts that last longer?

I have the Magpul grip that holds a spare bolt piece and firing pin. Who makes quality comparable to Colt but decently priced that would drop in?

I have mag pul furniture, BCM charging handle, and a flip up iron.

I am going to mount an ACOG at some point. I tend to shoot my .22 rifles and ak more because of ammo costs but still love my M4.

What spare parts should I have on hand?

[ErikTaylor]

Good choice on rifle. I've put 12,000 rounds through my 6921 so far and I have only had to replace the gas rings. I would recommend you getting a few sets of those ($3 part). As far as the bolt any MPI, shot peened bolt will do you fine. Colt and BCM are good choices. The gunfighter you chose is a wonderful upgrade. You can't break them, at least I haven't yet and I get pretty aggressive when racking my CH. I have broken my stock one, and also a gas buster. So far this one is going good.

Just be careful when you start messing with springs, buffers, carriers, etc you can cause reliability issues with short stroking, etc.

[SHIVAN]

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