This is a complete 9 mm AR-15. I had the 9 mm upper on a different rifle before. Due to that and swapping it on to this different lower receiver, there's going to be a little bit of fine-tuning needed on the purchaser's end. Was going to need tuning is the blocks that go in the lower receiver. They need to be just right in place. It's as simple as shooting in a bit and adjusting the blocks. This AR is designed to take standard Glock magazines. The lower is a homemade "extra parts" special. It will come with a magazine cutting block, you simply take a polymer magazine and essentially scrape a little Groove into it so that the AR receiver will accept the Glock magazine and retain it in place. This will come with one magazine off brand. 

Can seperate upper from lower. 

About 775.00$ invested into this.