AR .308 Caliber Builders Kit

Product Description

The GUNTEC AR .308 Caliber Builders Kit is a collection of small parts designed for AR-10 pattern rifle builds in .308 Winchester. This kit addresses the common challenge builders face when sourcing individual components for a complete lower and upper assembly.

AR-10 builds require different spec parts than AR-15 builds due to larger dimensions and different pin sizes. This kit bundles those parts together.

Key Facts

• Brand: GUNTEC
• Product Name: AR .308 Caliber Builders Kit
• SKU: GT-BUILD-KIT-308
• Caliber Platform: .308 / AR-10 pattern

What This Kit Is For

AR-10 pattern builds in .308 Winchester use larger and heavier components than AR-15 builds. Pins are thicker, springs are stronger, and detents need to handle more force. Missing even one small part can stall a build for days.

This builders kit is meant to supply those small parts in one package. It pairs with lower receiver components and separately purchased uppers, barrels, and bolt carrier groups.

Send us a message to confirm which specific parts are included in this kit before ordering.

Rifle Kits 308: What to Know Before You Buy

A builders kit is not a complete rifle. You will still need a stripped or complete lower receiver, an upper receiver assembly, a barrel, a bolt carrier group, a charging handle, and a stock or brace.

Texas law allows you to build your own rifle for personal use without serializing it, as long as you are legally allowed to possess firearms. An FFL transfer is required only for the lower receiver itself, not for parts kits like this one.

If you are new to AR-10 builds, consider having a gunsmith inspect your completed build before firing. Headspace and gas system tuning matter more in .308 than in 5.56.

Ordering from Western Sport

Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: What parts are included in the GUNTEC AR .308 Caliber Builders Kit?

A: The specific parts list should be confirmed before purchase. Send us a message to verify contents, as builders kits vary by manufacturer and SKU.

Q: Will this kit work with my AR-10 lower receiver?

A: This kit is designed for AR-10 pattern rifles in .308 caliber. AR-10 lowers from different manufacturers can have minor dimensional differences, so verify fitment if you are using a non-standard lower.

Q: Do I need an FFL transfer to buy this 308 rifle kit?

A: No, builders kits containing only small parts do not require an FFL transfer. Only the lower receiver itself requires transfer paperwork. Western Sport handles FFL transfers for receivers and can order the rest of your build components.

Q: Can I build a complete rifle with just this kit?

A: No, this is a parts kit only. You will need a lower receiver, upper receiver, barrel, bolt carrier group, charging handle, stock or brace, and a magazine to complete a functional rifle. Western Sport can source the remaining components for your build.

Q: Is this kit compatible with AR-15 parts?

A: No, AR-10 and AR-15 platforms use different size pins, springs, and detents. Parts are not interchangeable between the two platforms. This kit is for .308 / AR-10 pattern rifles only.