Kral PB sling adaptors by jonnyg30

Last crawled date: 4 years ago

Adaptors to fit a sling to the Kral Puncher Breaker bullpup.
The fore grip is is too short allow effective mounting of a sling swivel without it getting in the way. The first adaptor allows the sling to be mounted further up keeping it out the way and ensuring the rifle sits better when slung over the shoulder. It does not impede access to the mag storage on the synthetic stock model.
The second part is a simple shaped "nut" to allow secure fixing to the rear of the stock on synthetic models. (I'd advise putting the stud a good few mm further forward than I have so it doesn't interfere with the butt pad, mine only just fit)
WARNING/DISCLAIMER:
1) Use this at your own risk. Choose your material and print settings wisely to gain the strongest print possible. I strongly advise inspecting the part for any defects and testing over something soft such as a sofa or a bed in case Newton decides to have his way with your rifle should the part fail! I've had no issues with mine since produced.
2) Do NOT attempt to simply screw the sling stud into the part, all you will do is cause it to split.
PARTS REQUIRED:
Standard front and rear sling stud set (self tapping thread)
PRINT SETTINGS:
All Parts printed in ABS @ 0.2mm layer height (best layer adhesion on my printer), no supports necessary and 100% infill. I added 1% increase all axis to account for shrinkage.
FINISHING:
This part needs to be a "snug" fit, so you will need to file/sand the the rings to final dimensions as necessary (shouldn't take much, mine only required a bit of smoothing). I decided to sand down and acetone smooth my part so it looked a bit nicer and sealed all the layers
fitting the studs: ensure plastic washer is not fitted to stud. Grasp the stud in a pair of pliers or similar and gently heat with a jet lighter/small blowtorch or whatever you can find. Do not over heat! it needs to be just hot enough to soften the plastic (between 10-20 seconds of heating with a jet lighter worked for me). carefully screw in until resistance is felt, wait a few seconds for plastic to set then unscrew and repeat the process. Keep doing this until the stud is fully inserted but don't worry about it lining up at this point (this took several cycles for me). fit plastic spacer washer, screw stud in and line up as necessary.
For the rear stud on synthetic stocks, carry out the above off the rifle with the shaped nut. pilot drill the stock and then fit as normal.