Modulus Arms

The Modulas Arms items are the industry BEST. They work and fit most any lower made and turn out the BEST finished product. It HAS been compared to others, by me!

Just what I ordered (#2B router bit)and fast shipping. Very pleased!

Wow. I've seen a several lowers milled and drilled from various kits, but my 5D multiplatform starter kit produced the best results I have seen short of a CNC machine. All milled surfaces were clean and crisp giving the appearance of a professionally milled lower. The kit was very simple to use, the end mill sharp (no appreciable difference after my 3rd lower), and the instructions easy to follow. It took less than an hour to produce my first one and I couldn't be happier with the results. If you're considering a kit, I strongly recommend the 5D starter kit. You will not be disappointed.

The router price jig worked great love the product

I had more fun than I thought I would. It was very easy to do the milling. Took about 1 1/2 hours for the AR-15 lower. Pins were snug and fit well. I would recommend fully enclosed eye protection. Used WD as my lubricant. Never took more than the small increments. It will be interesting to see how many uppers I will be able to do with a single bit. Took a couple weeks to ship, keep that in mind.