Will this fit billet lower receivers?

In most cases, yes. However, since billet lowers vary, it's recommended to check with your lower manufacturer to confirm compatibility.

What parts do I need to install the bolt catch?

You'll need the bolt catch itself, a spring, a plunger, and a roll pin. Using a roll pin punch set is highly recommended for installation.

Is this bolt catch compatible with all AR-15 calibers?

Yes, this bolt catch is compatible with all standard AR-15 platform calibers including .223, 5.56, and .300 Blackout.

Do you offer an installation guide?

Yes. You can follow our complete step-by-step guide here: https://www.mountsplus.com/how-to-install-ar-15-bolt-catch.html

AR-15 Bolt Catch | Mil-Spec Replacement for Lower Builds

Q: Is this AR-15 bolt catch mil-spec?

Yes — it’s manufactured to military specifications and designed to fit all standard AR-15 lower receivers.

AR-15 Bolt Catch | Mil-Spec Replacement for Lower Builds

AR-15 Bolt Catch Spring

How to install AR-15 Bolt Catch

**Magpul BAD Lever - Battery Assist Device - AR15/M16** $31.30

**Wheeler AR Bolt Catch Punch Kit** $20.34

**Tps AR-15 Bolt Catch Assembly Ss** $16.59

**Tps AR-15 Bolt Catch Assembly** $14.74

**Strike Industries AR-10 Enhanced Bolt Catch** $14.95

**Strike Industries Extended Bolt Catch** $14.95

**Strike Industries Enhanced Bolt Catch** $14.95

**Santan Ar15 Ultra Grip Bolt Catch Bk** $19.79

**Luth-AR Paddle Bolt Catch 308** $23.45

**Luth-AR Paddle Oversized Bolt Catch** $20.63

**BATTLEARMS .308 Enhanced Bolt Catch** $15.95

**BATTLEARMS Enhanced Bolt Catch Blk** $39.00

**BATTLEARMS Enhanced Bolt Catch Pcc 9mm** $39.00

AR-15 Bolt Catch – Mil-Spec Replacement for Your Lower Build

A reliable AR-15 bolt catch is essential for any build, upgrade, or repair. It’s the small but critical component that locks the bolt open after the last round, making reloads smooth and consistent. Whether you’re assembling a new lower, replacing a worn part, or upgrading to mil-spec hardware, this bolt catch is made to meet or exceed industry standards.

Precision-machined from hardened steel, this component fits seamlessly with all mil-spec AR-15 lower receivers, ensuring proper bolt hold-open function every time. It’s compatible with forged or billet lowers and works with standard roll pins, detent springs, and plungers.

Don’t overlook the basics—when your bolt catch fails, reliability is out the window. This small part makes a big difference in performance and peace of mind.

🔧 Features:

✅ Machined to mil-spec tolerances for exact fit
✅ Compatible with most forged and billet AR-15 lowers
✅ Durable steel construction for long-term use
✅ Works with standard spring, plunger, and roll pin
✅ Ideal for custom builds, field repairs, and replacements

🛠️ Installation Made Easy

Need help with the install? Check out our full guide:
👉 How to Install an AR-15 Bolt Catch

🔧 Complete Your AR-15 Bolt Catch Installation

For a smooth, reliable install, make sure you have the complete set of parts and tools:

AR-15 bolt catch spring – Provides tension for proper bolt engagement
AR-15 lower parts kits – Includes the bolt catch and other critical components
AR-15 gunsmithing tools – Everything you need for professional assembly
Armorer’s tool kits – Full kits for advanced builders and armorers
How to install an AR-15 bolt catch – Step-by-step guide to do it right the first time

💬 Frequently Asked Questions

Q: Is this AR-15 bolt catch mil-spec?
A: Yes — it’s made to mil-spec dimensions and materials, ensuring a perfect fit with most standard AR-15 lowers.

Q: Will it fit a billet lower receiver?
A: Most billet lowers accept mil-spec bolt catches, but check with your lower’s manufacturer to confirm.

Q: What other parts do I need for installation?
A: You’ll need a bolt catch spring, plunger, and roll pin. We recommend a punch set for clean installation.

Q: Can I install this myself?
A: Yes. With the right tools (like a roll pin punch set), installation takes just a few minutes.

Q: What if I want an upgraded or enhanced bolt catch?
A: This version is mil-spec, but we also offer enhanced models with extended paddles for faster bolt release.