Pronouns: It, That
- Jul 29, 2014
I recently built a 5" RDB 9mm upper.
1) Are there any Colt mag adapters that work w/ this? Even after removing the ejector and feed ramp of the ones I have to get the upper & lower to close, the mags are held way too high. Do I have to use Endomags?
2) Approx what weight buffer am I going to need to run? I have an 8.2oz 9mm buffer for my blowback gun. Am I going to need lighter? Shooting 147gr subs almost exclusively.
I was able to adapt the RDB to my New Frontier MP5 lower by removing material from the removable feed ramp 'wings'. Those are what stops your upper from closing. Be sure to use a standard upper receiver or one that is made for the RDB(having the cam key cutout).
This may look like a lot but it is roughly .055" shorter than the factory feed ramp on the right. It's just the angle and the shortened one is in situ while the factory one is being held there by my thumb.