OSA15 AR15 Upper receiver (Thermal Fit)
Same quality as our Lower Receiver, color matched to your lower. Lugs are held to the high end of the tolerance to help promote a snug fit with the lower receiver.
- Machined from a 7075-T6 forging
- Machined to the government print
- M4 Feed ramps
- Lugs held to the high end of the tolerance, .4960" to .4970"
