Mega Arms MTS Monolithic AR15 Upper Review
![](https://substackcdn.com/image/fetch/w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F521c357a-7697-4e7d-af49-a630b2b5229f_400x253.jpeg)
Mega Arms MTS Modular Monolithic AR15 Upper V2 Review
Several months ago, I reviewed the Mega Arms GTR-3S Billet lower receiver. Initially the Mega Billet lower was the foundation for a DPMS Oracle kit build, but since has been a favorite base testing platform for a number of AR upper builds. Mega’s billet lower was of such high quality that I couldn’t …