The AR Essential Parts Kit is basically known as the "Oops Kit." It's definitely what you'll need if you plan on building as AR. To see & hear a spring go flying in the house while you're assembling your build is quite common. Finding it is a whole other thing. Don't be foolish wasting your time finding that spring, buy an Oops Kit by Smith & Wesson...

I charge a 10% restocking fee and all fees associated with this purchase (including credit card refund fees). All cancelled orders will be charged a 10% restocking fee as well.

Ernie's Arms Accessories will select the most cost effective carrier to deliver your product.

A $5 Processing Fee will be added to every online purchase.