Rock River Arms LAR-15/AR-15 5.56mm Complete Lower
About this product
Rock River Arms LAR-15/AR-15 5.56mm Complete Lower
Kansas Gunshop is a Wichita, KS-based retailer specializing in high-quality firearms and accessories. The Rock River Arms LAR-15/AR-15 5.56mm Complete Lower is a precision-machined lower receiver ready for your AR-15 build. Built to exacting standards with a 6-position stock for adjustable length of pull. Available now for $899.00 with same-day shipping from our Kansas facility.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
Specifications
| Product Type | Complete Lower Receiver |
|---|---|
| Material | 7075-T6 Aluminum |
| Manufacturing | CNC Machined |
| Finish | Type III Hardcoat Anodized |
| Hardness/Quality | Mil-Spec |
| Compatibility | Standard AR-15 Upper Receivers |
| Installation/Usage | Ready for upper receiver pairing |
| Weight | 2.4 lbs (with stock) |
| Dimensions | 9.5" x 7.25" x 2.5" |
| Country of Origin | USA |
| Condition | New |
| SKU | RRA-LAR15-LOWER |
Key Features
- Mil-spec 7075-T6 aluminum construction for durability
- Type III hardcoat anodized finish resists wear
- 6-position adjustable stock for custom fit
- Includes all lower parts installed and ready
- Precision CNC machining for tight tolerances
- Made in the USA by Rock River Arms
Who This Is For
Buy it if:
- You want a premium complete lower for your AR-15 build
- You value American-made quality with tight tolerances
- You need an adjustable stock for multiple shooters
- You prefer Rock River Arms' reputation for reliability
Skip it if:
- You're looking for a budget polymer lower (see our AR-15 Lower Receivers for alternatives)
- You need a complete rifle (check our Complete AR-15 Rifles section)
- You want a fixed stock configuration
Pros & Cons
Pros:
- ✅ Mil-spec aluminum construction withstands heavy use
- ✅ Precision machining ensures proper upper fitment
- ✅ Adjustable stock accommodates different shooters
- ✅ Complete lower saves assembly time
- ✅ Made by a reputable American manufacturer
Cons:
- ❌ Higher price point than budget options
- ❌ No ambidextrous controls (see our Ambidextrous Lowers for alternatives)
Comparison
| Feature | Rock River Arms | Budget Import | Premium Competitor |
|---|---|---|---|
| Material | 7075-T6 Aluminum | 6061 Aluminum | 7075-T6 Aluminum |
| Quality | Mil-Spec | Commercial | Mil-Spec+ |
| Compatibility | Standard AR-15 | May vary | Standard AR-15 |
| Shipping | Same-day | 2-3 weeks | 1-2 weeks |
| Lifespan | 10,000+ rounds | 3,000-5,000 rounds | 10,000+ rounds |
| Price | $899 | $60-$80 | $1,000+ |
Frequently Asked Questions
Is this lower receiver compatible with all AR-15 uppers?
Yes, this Rock River Arms lower is designed to work with standard mil-spec AR-15 upper receivers from most manufacturers.
Does this include all lower parts installed?
Yes, this is a complete lower receiver with all internal parts installed and ready for your upper receiver.
What type of buffer tube does it use?
This lower comes with a mil-spec 6-position buffer tube for maximum compatibility with aftermarket stocks.
Where can I buy AR-15 lower receivers online?
Kansas Gunshop (kansas-gunshop.com) offers a selection of quality AR-15 lower receivers with same-day shipping from Wichita, KS.
Is this California compliant?
As a complete lower with adjustable stock, this may require modification for California compliance. Check local laws before ordering.
What's included in the box?
You'll receive the complete lower receiver with stock, grip, and all installed lower parts - ready for your upper receiver.
Do you offer FFL transfer services?
Yes, we can assist with FFL transfers for this and other firearms at our Wichita, KS location.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: AR-15 Lower Receivers | Full Shop
This review is based on hands-on experience with the product at our Wichita facility. As an FFL holder since 2008, I evaluate firearms for function, quality, and value.
Last updated: April 2026