Colt AR-15 Sporter SP1 .223 Rem. Pre-Ban Semi-Automatic Rifle, 20" Chrome-Lined Pencil Barrel, 1977 Production
This 1977 Colt AR-15 Sporter SP1 is a true pre-ban example that retains the classic, Vietnam-era silhouette collectors look for. A slick-side upper, early lower without a magazine-release fence, and pencil-profile chrome-lined barrel give it the authentic A1 appearance, while the “C MP CHROME BORE” stamp and SP-prefix serial confirm its period-correct pedigree.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: The aluminum receivers display a few scattered scratches and small finish blemishes consistent with gentle handling. The chrome-lined bore is bright and retains sharp rifling, indicative of careful maintenance.
What’s Included
- Colt AR-15 Sporter SP1 rifle
- 3 × 30-round USGI pattern alloy magazines
- 1 × 20-round USGI pattern alloy magazine
- Khaki cotton/nylon military-style sling
The 20-inch pencil barrel keeps the rifle light and well-balanced while delivering the period-correct 1:12" right-hand twist for 55-grain ammunition. Its chrome lining aids in corrosion resistance and simplifies cleaning.
A closed-end six-slot M16A1 birdcage flash suppressor sits on standard 1/2-28 threads, preserving the original look while allowing modern accessory options. The barrel’s “C MP” marking verifies Colt manufacture and magnetic-particle inspection.
The slick-side upper lacks a forward assist and case deflector, matching early military production. Coupled with the large screw-type front pivot pin and fixed triangular handguards, the rifle mirrors the classic M16A1 profile.
Iron sights consist of a fixed A-frame front post and a carry-handle rear drum adjustable for windage and elevation out to 800 yards. A 13.0" length of pull on the fixed polymer stock provides comfortable shouldering for most shooters.
Being manufactured before the 1994 Federal Assault Weapons Ban, this SP1 is eligible for compliant ownership in states that recognize pre-ban status, adding tangible collector value.