Building a retro AR or going for that clean, old-school look? The A1 Slick Side 5.56mm Upper Receiver from Retro Arms brings classic design and modern precision together in one solid package.

Inspired by the iconic M16A1 used during the Vietnam era, this upper features the sleek slick side profile no forward assist, just a lightweight, streamlined build that keeps your rifle looking sharp and balanced.

It’s machined from rugged 7075-T6 aluminum and finished with a durable MIL-SPEC hardcoat anodize. The fit is tight, the feel is solid, and it’s fully compatible with standard 5.56mm components, making it a reliable choice for custom builds or restoring a classic setup.