[m21sniper]

A chrome lined chamber is a lot less likely to suffer an extraction malfunction if dirty.

A 1:7 barrel lets you fire every 5.56mm round on the market.

A good, crisp trigger pull is the single easiest way to reduce group sizes.

Do you "need" any of them? No. But if you're going to spend money on options, those are the options that return the most bang for the buck.