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OF AR UPGRADES!

Shop Geissele Uppers,
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Upgrade Your AR!
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Rifle Caliber Conversion Kits

9 Items

Rifle Caliber Conversion Kits Up To 18% Off— 9 Products In Stock / 5 Models

Our Rifle Caliber Conversion Kits lineup includes 9 in-stock products selected from the brands serious shooters and outdoorsmen rely on. Enjoy savings Up To 18% Off on qualifying orders, all protected by our Forever Guarantee®.

You'll find options across from 6 premium brands like STERN DEFENSE, LLC, HOGUE, CMMG, BROWNELLS, with detailed specs to help you compare quality, materials, and performance. Verified buyers give our Rifle Caliber Conversion Kits 4.4 Ratings out of 288 Reviews from verified buyers, a strong signal you can shop with confidence.

Whether you are gearing up for the range, the field, or daily carry, we stand behind every Rifle Caliber Conversion Kits product we ship. Visit our full Rifle Parts category for the complete selection of related gear.

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Products:  1  –  9  of 9
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Product badge CMMG - AR-15/M16 22LR BRAVO CONVERSION KITS CMMG - AR-15/M16 22LR BRAVO CONVERSION KITS
5 Stars
(4.5)

$157.99 - $186.99

$184.99 - $189.99

Select Items In Stock
STERN DEFENSE, LLC - AR-15 9MM CONVERSION ADAPTER STERN DEFENSE, LLC - AR-15 9MM CONVERSION ADAPTER
5 Stars
(4.7)

$179.99 - $186.99

In stock
BROWNELLS - AR-15 EJECTION PORT COVER SPRINGS BROWNELLS - AR-15 EJECTION PORT COVER SPRINGS
5 Stars
(4.2)

$3.99 - $6.99

Select Items In Stock
COLT - AR-15/M16 9MM DEDICATED CONVERSION BLOCK COLT - AR-15/M16 9MM DEDICATED CONVERSION BLOCK
5 Stars
(4.5)

$119.99

In stock
HOGUE - AR-15 FREEDOM FIGHTER FIXED MAGAZINE CONVERSION KIT HOGUE - AR-15 FREEDOM FIGHTER FIXED MAGAZINE CONVERSION KIT
5 Stars
(4.5)

$55.21

In stock
BOONIE PACKER PRODUCTS - AR-15/M16 BETTER-MAG S&W M&P 15-22 MAGAZINE CONVERSION ADAPTER BOONIE PACKER PRODUCTS - AR-15/M16 BETTER-MAG S&W M&P 15-22 MAGAZINE CONVERSION ADAPTER
5 Stars
(3.6)

$61.99

In stock
STERN DEFENSE, LLC - AR-15 M&P 45ACP CONVERSION ADAPTER STERN DEFENSE, LLC - AR-15 M&P 45ACP CONVERSION ADAPTER
5 Stars
(5.0)

$186.99

In stock
Product badge CMMG - 22ARC STAINLESS STEEL BRAVO RECEIVER FRAME CMMG - 22ARC STAINLESS STEEL BRAVO RECEIVER FRAME
5 Stars
(0.0)

$38.99

$47.69

Online Only - Special Order. Please allow 4-5 weeks additional processing time.
HOGUE - AR-15 FREEDOM FIGHTER FIXED MAGAZINE CONVERSION REFILL KIT HOGUE - AR-15 FREEDOM FIGHTER FIXED MAGAZINE CONVERSION REFILL KIT
5 Stars
(0.0)

$38.21

In stock
Products:  1  –  9  of 9