| High Performance Bolt Carrier Completion Kit by Leitner-Wise Denfense for AR-15/M4 Rifles and Carbines
This High Performance Bolt Assembly Completion Kit for AR-style AR-15/M4/M16 rifles includes bolt assembly, firing pin, cam pin and retainer pin. But instead of the standard 8620 bolt, it comes with the NEW high performance bolt assembly made by Leitner-Wise specifically for JP from SAE 9310 steel with at least ten times the life expectancy of a mil-spec 8620 bolt. Includes complete SAE 9310 bolt assembly, firing pin, cam pin, and cotter pin.
This kit has a high performance bolt and extractor to match the outstanding JP bolt carriers that we offer. Standard Mil-spec 8620 bolts and extractors have a number of Achilles heels, so to speak. The result is a life expectancy of about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds. Other problems include cracking at the cam pin hole and week extractor spring tension.
The material used in standard bolts is also not the best choice by todays standards. But if you remember that old story that explains why “Mil-spec never dies”, well that applies here also. They make them this way because they’ve always made them this way. Our new bolt is made from SAE 9310 high grade steel. With this material, an extremely hard surface with a tough ductile core resistant to structural failure is provided resulting in a ten fold improvement in life expectancy. This has been observed in actual full auto endurance torture tests. SAE 9310 is the same type of steel used in the tranmission gears of formula one race cars. The high load application of a bolt assembly is the ideal application for this state of the art material.
In addition, many other fine points have been addressed such as incorporating radiuses in all the traditional 90 degree corners of the locking lug areas and other features. This further enhances the ability of the bolt to handle high loads over a much longer life span. We highly recommend this bolt and completion kit as a compliment to your JP high performance bolt carriers or any rifle system. It sounds expensive by comparison, but for most people, it is a lifetime part. Look at it this way, it’s three times the price, but lasts 10 times as long. It’s actually a bargain.
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