Keep your rifle running smoothly and to true factory spec with the Colt AR15A4 Bolt Catch – Part #160308100. This is a genuine Colt OEM bolt catch designed specifically for the Colt AR15-A4 and fully compatible with standard AR-15, AR-15/M4, and M16 pattern rifles, finished in a durable matte black to match modern receivers. colt-guns.com+3Brownells+3Blackstone Shooting Sports+3
Genuine Colt Factory Replacement Part
When you’re repairing, refreshing, or completing a build, small parts like the bolt catch are not the place to cut corners. This part is listed by Colt distributors and Brownells as a “Factory replacement Bolt Catch for Colt AR15-A4 rifles. Also fits standard AR15 pattern rifles.” Brownells+1
Because it’s a true Colt part, you get the proper dimensions, clean machining, and reliable function expected from factory-spec components.
Designed for AR15-A4 & Standard AR-15 Platforms
Multiple retailers and Colt listings describe this part as a bolt catch for Colt AR15A4 and standard AR-15 rifles, making it a versatile choice for a wide range of builds. Brownells Österreich+3Brownells+3Brownells UK+3
Compatible platforms include:
If your lower receiver is built to common AR-15 spec, this Colt bolt catch is engineered to drop into the standard recess and interface correctly with your bolt carrier and magazine follower.
Role of the Bolt Catch in the AR-15 System
The bolt catch is a small but critical control on the AR-15 platform. It:
Locks the bolt open on an empty magazine, aiding reloads and clear checks
Allows the user to manually lock the bolt to the rear for inspection, maintenance, and safe handling
Interfaces with both the bolt carrier and magazine follower to provide tactile feedback and consistent operation
By replacing a worn, out-of-spec, or damaged bolt catch with a Colt-spec AR15A4 bolt catch, you help maintain consistent lock-back and reliable function across different magazines and ammunition, as highlighted by product descriptions from Brownells and other vendors. Brownells+2Brownells UK+2
Robust Steel Construction & Matte Black Finish
Product listings describe this part as a precision-engineered steel bolt catch with a matte black finish, designed to withstand the repeated impacts and stresses of daily use. Blackstone Shooting Sports+2Frisco Guns+2
Material: Steel (hardened for durability)
Finish: Matte black, blends cleanly with modern anodized receivers and lowers
Shipping weight: Around 0.014–0.03 lb depending on retailer packaging Frisco Guns+2Brownells Österreich+2
The matte finish reduces glare and gives your lower receiver a cohesive look alongside Colt pins, selectors, and magazine releases.
Ideal for Builds, Repairs & OEM-Correct Restorations
Because it’s a factory Colt part, the AR15A4 Bolt Catch 160308100 is especially well-suited for:
Colt-correct clone builds – AR15-A4, M16-style, or AR-15/M4 rifles using genuine Colt components colt-guns.com+1
Routine maintenance and repair – replacing a rounded, chipped, or unreliable bolt catch to restore proper lock-back
Armorer spares – stocking OEM small parts for service rifles and training carbines
Retailers routinely categorize this part under gun parts → rifle parts → rifle receivers & parts, emphasizing its role as a core functional component rather than a cosmetic accessory. Brownells+2Brownells+2
Simple, Familiar Installation (Gunsmith/Armorer Level)
Installation of a bolt catch on an AR-15 lower uses the familiar bolt catch roll pin, spring, and plunger system. While specific instructions aren’t bundled with the part, it fits standard AR-15 lower receiver geometry. Brownells+1
General guidance:
Ensure the firearm is unloaded and safe before any work
Use proper tools (roll pin punch, support block) to avoid marring the receiver
Install with a compatible bolt catch spring and plunger (often sold separately if not already present)
If you’re not comfortable working on lower receiver internals, most users rely on a qualified armorer or gunsmith for installation.
What Sets the Colt AR15A4 Bolt Catch Apart
Customer reviews on Brownells and other retailers frequently note that Colt bolt catches have cleaner machining and better finishing compared to many budget parts. One Brownells EU review specifically calls the Colt piece “immaculate” and worth the small price difference over cheaper options. Brownells Italia+1
Key advantages:
OEM Colt quality – dimensions and fit tested on Colt platforms
Reliable function – designed as a factory replacement for AR15-A4 rifles
Matte black finish – blends with Colt and other mil-spec lowers
Cross-platform compatibility with standard AR-15, AR-15/M4, and M16 pattern rifles colt-guns.com+3Brownells+3Brownells UK+3
Quick Specs – AR15A4 Bolt Catch 160308100
Brand: Colt
Model: AR15A4 Bolt Catch
Part Number / SKU: 160308100 Brownells+2Frisco Guns+2
Type: Factory replacement bolt catch
Platform Compatibility:
Material: Steel
Finish: Matte black
Category: Rifle receivers & parts / bolt catch parts Brownells+1
If you’re maintaining a Colt rifle, finishing a correct AR15-A4 build, or simply want a factory-spec bolt catch you can trust, the Colt AR15A4 Bolt Catch 160308100 is a proven, OEM-focused choice.
The End
