Big-bore AR-style rifles are a unique niche for shooters who want cartridge-level stopping power in a familiar semi-auto chassis. For defense-minded owners and range enthusiasts who prioritize heavy-hitting terminal performance without moving to a bolt action, this builds a compelling argument.
ROCK RIVER ARMS LAR-15. This listing pairs a ROCK RIVER LOWER with a BUSHMASTER UPPER chambered in .450 Bushmaster, giving you the large-bore performance of the .450 Bushmaster cartridge in a Semi Auto platform. The package price is $959.99 and represents a focused option for those seeking straight-walled cartridge capability.
HWK XL 5.56 Giveaway
No purchase necessary
Entry link emailed immediately
A third-party retailer is currently hosting a giveaway for an HWK XL 5.56 pistol package (≈ $1,800 retail value).
I track legit firearm & gear giveaways and share the official entry links when they go live.
Overview
The ROCK RIVER ARMS LAR-15 combines a Rock River Arms lower receiver with a Bushmaster upper chambered for .450 Bushmaster. That specific configuration—ROCK RIVER LOWER BUSHMASTER UPPER 450 BUSHMASTER—keeps the platform familiar for AR users while delivering the punch of a large straight-walled cartridge. As a Semi Auto entry, it fits shooter’s expectations for controllability, follow-up shots, and modular upgrades.
Shop this product to view the full product page and transition to the retailer purchase flow.
Ballistics & Practical Applications
The .450 Bushmaster is designed for heavy-for-caliber bullets and strong terminal performance at typical defensive and hunting ranges. It excels inside 200 yards where shot placement and straight-walled case design matter; many owners choose it for home defense scenarios that prioritize energy transfer and barrier performance, as well as for legal straight-walled hunting in applicable jurisdictions. Its large-diameter projectiles deliver reliable knockdown potential compared with smaller rifle calibers.
Platform Benefits
Using a Rock River lower gives you a robust receiver with parts compatibility across AR-pattern accessories. The Bushmaster upper in this configuration is optimized for the .450 Bushmaster cartridge, meaning appropriate barrel profile, chambering, and gas system tuning for reliable cycling. At $959.99, this semi-auto package is competitively positioned for shooters who want a ready-to-run big-bore AR platform.
View product details and pricing to confirm current inventory and specifications before purchase.
Final Notes for Buyers
If you want a semi-auto platform that brings straight-walled cartridge power to an AR-style package, the ROCK RIVER ARMS LAR-15 with its ROCK RIVER LOWER and BUSHMASTER UPPER in .450 Bushmaster is worth evaluating. Check accessory compatibility, local laws for large straight-walled cartridges, and confirm the $959.99 listing on the shop page. Check current availability to proceed to purchase from the retailer.
Want exclusive intel on gear drops & discounts?
People Also Ask
What makes this product stand out from competitors?
This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.
Is this product suitable for beginners?
Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.
What warranty or support is available?
The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.
How does this compare to similar products in its price range?
This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.
What maintenance is required?
Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.
Ready to Get Started?
Experience the quality and performance that makes this product a top choice.
Leave a Reply
You must be logged in to post a comment.