Do I need a complete AR-15 lower parts kit or individual pieces?

If you’re building a new lower, a complete lower parts kit is recommended. If you’re upgrading or replacing, you can purchase individual AR-15 components.

Are your AR-15 parts made in the USA?

Yes, many of our AR-15 parts are USA-made from high-quality materials. Check product descriptions for manufacturing details.

AR-15 Parts | Mil-Spec, Custom & Lower Parts Kits

Q: Do these AR-15 parts fit any lower receiver?

Yes, most of our AR-15 parts are designed to fit mil-spec lower receivers, including both forged and billet models.

Q: What’s the difference between mil-spec and custom AR-15 parts?

Mil-spec parts follow government standards for compatibility and reliability, while custom AR-15 parts enhance ergonomics, performance, or aesthetics.

Q: Which AR-15 parts should I upgrade first?

Most shooters start with upgrades like triggers, safeties, magazine releases, and charging handles for noticeable improvements in handling and performance.

AR-15 Mag Release

Bolt Carrier Groups

Bolt Catch

AR-15 End Plate

Gas System Parts

Recoil Parts

Safety Selector

AR-15 Springs

Takedown Pins

AR-15 Triggers

Red AR 15 Parts

AR-15 Forward Assist

Dust Cover / Ejection Port Cover

AR-15 Lower Parts Kit

AR15 Upper Parts Kit

AR-15 Barrel

**ERGO AR-15 Lower Spring Replacement Kit** $7.45

**ERGO AR-15 Upper Spring Replacement Kit** $7.45

**ERGO AR-15 Upper & Lower Spring Replacement Kit** $14.00

**Elftmann Speed Safety - Push Button AR15 Ambidextrous Safety** $37.95

**Matador Arms STINGER AR Muzzle Brake w/ Muzzle Blast Diverter** $89.99

**Geissele SSA: Super Semi-Automatic AR-15 Trigger** $240.00

**Timber Creek Outdoors AR Takedown Pin Sets** $15.99

**Timber Creek Outdoors AR Extended Magazine Release** $15.99

**Timber Creek Outdoors AR Oversized Trigger Guard** $19.19

**Timber Creek Ambidextrous Safety Selector** $31.99

**Timber Creek Outdoors QD End Plate** $15.99

**Deltac 28pc AR-15 Lower Parts Kit** $32.95

**DELTAC Ejection Port Cover kit for AR-15 (Made in USA)** $14.95

**Aim Sports Mil-Spec Flash Hider, 1/2-28** $11.95

**Timber Creek Outdoors Billet AR-15 Dust Cover** $23.95

**Aim Sports AR-15 Lower Parts Kit** $61.95

**Aim Sports AR 15 Buffer Spring** $6.95

**Timber Creek Greyman Ambidextrous AR-15 Charging Handle** $115.95

**Timber Creek Greyman Billet Dust Cover - AR15 Dust Cover** $33.95

**Timber Creek Greyman QD End Plate** $23.95

**Timber Creek Outdoors AR-15 Lower Parts Kit** $89.99

**Bcmgunfighter AR-15 Enhanced Lower Parts Kit** $123.07

AR-15 Parts – Mil-Spec & Custom Rifle Components

At Mounts Plus, we stock one of the most complete selections of AR-15 parts online, from mil-spec essentials to custom rifle upgrades designed for speed, accuracy, and reliability. Whether you’re replacing worn components, upgrading your rifle for performance, or starting a brand-new build, you’ll find everything you need right here.

🔧 Why Choose Mounts Plus for AR-15 Parts?

We know the AR platform inside and out, and that’s why our inventory covers both basic replacement parts and enhanced components for builders who demand more. Each product is tested for fitment, made from quality materials, and sourced from trusted brands like BCM, Timber Creek, Aero Precision, and ERGO.

What we offer:

AR-15 lower parts kits (LPKs) for complete builds
Individual replacement parts like pins, springs, and selectors
Custom AR-15 parts for ergonomics, speed, and aesthetics
USA-made AR-15 components from top manufacturers
Budget-friendly options that don’t cut corners

⚙️ AR-15 Mil-Spec vs. Custom Parts

Mil-Spec AR-15 Parts → Built to government standards, perfect for reliability, compatibility, and duty builds.
Custom AR-15 Parts → Designed for shooters who want more control, faster handling, and upgraded ergonomics.

Most builders mix the two — mil-spec for core reliability, custom upgrades for improved performance.

🛠️ Buying Guide: Choosing the Right AR-15 Parts

Building from scratch? Start with a complete lower parts kit for guaranteed compatibility.
Upgrading? Swap small controls like magazine releases, safeties, or takedown pins for instant improvements.
Customizing aesthetics? Choose anodized or cerakote finishes to match your rifle’s look.
Performance-focused? Opt for ambidextrous controls, enhanced triggers, or extended mag catches.

Our collection covers everything from small pins and springs to complete AR-15 lower parts kits — all backed by fast shipping and real-world reliability.

🛡️ Trusted by Builders & Professionals

Our AR-15 parts are chosen by competitive shooters, professional gunsmiths, and law enforcement alike. With USA-made components, fast delivery, and a curated inventory, we make it easy to build, repair, or enhance your AR platform with confidence.

❓ Frequently Asked Questions (FAQ)

Do these AR-15 parts fit any lower receiver?

Yes. Unless otherwise noted, our parts are designed to fit mil-spec AR-15 lowers, including most billet and forged receivers.

What’s the difference between mil-spec and custom AR-15 parts?

Mil-spec parts are built to standard government dimensions for compatibility. Custom parts focus on enhanced ergonomics, aesthetics, or faster performance.

Do I need a full lower parts kit or just individual pieces?

If you’re building a new lower, a complete AR-15 LPK is the easiest option. If you’re upgrading or repairing, you can buy individual replacement parts.

Are your AR-15 parts USA made?

Yes, many of our AR-15 components are machined in the USA from high-quality steel and aluminum. Check individual product listings for details.

Which AR-15 parts should I upgrade first?

Most shooters start with triggers, safeties, magazine releases, and charging handles for the biggest improvement in handling and performance.

🏁 Build, Repair & Upgrade with Mounts Plus

Whether you’re building a rifle from scratch or fine-tuning your current setup, Mounts Plus has the AR-15 parts to get it done right. From mil-spec kits to custom upgrades, our components are trusted by builders nationwide.