Excellent option - Midwest Industries Alpha Series M4 Beam Side Folder

Bought to complete a project with a Ruger charger. Looked at a bunch of different options and settled on Midwest Industries. Made in USA, and has ability to fold left or right. Most importantly it allows for use of both pistol braces or stocks and stocks are adjustable for length of pull like with a standard buffer tube(unlike a lot of metal folding stock options). Mechanism is a bit stiff at first but will get better with use. The product is not inexpensive but you get what you pay for and the quality is excellent. In my opinion the features and build quality make this worth the price. Buy with confidence.