Airsoft SR-25 Receiver Extension for BRX Rail
thingiverse
Receiver extension to fit a Bolt Airsoft CNC Aluminum BRX 3 13.5" Freefloat Handguard to a Matrix Full Size SR25-K Polymer Receiver. Feel free to modify as you need, these are all dimensionally set up to print on my specific setup and will most likely not work perfectly for you without adjustments.
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