This product was created for compatibility with milspec 80% AR15 lower receivers no matter whether they are polymer or metal. The Universal Jig is designed with a super rigid long-fiber nylon composite, which will allow the customer to utilize the jig up to 3 times. This low-cost jig is the perfect alternative to the expensive and more complicated metal jigs, especially if you’re just planning on building a few AR15 lowers – why pay more? The jig provides a stable platform for milling, and therefore encompasses the entire AR15 lower receiver. Other competing jigs are more difficult to secure the lower in the vise, and can damage the lower receiver while milling. RJ556U Kit Contains: 2 sided jig 3 trigger guides 9mm HSS end mill 5/16ths drill bit 3/8ths drill bit 5/32nd drill bit

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