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Hey kids do you like Bump Stocks? Do you like Pistol Braces? What if I combined the two?
Surprise Surprise... Well that's what I did, but I did it on my own lower.
This Ar-15 lower that was designed to be printed on an Ender 5 Plus or Creality K1Max (300mm X 300mm). However you can print the main body in two pieces attach them together. I have included pre-cut files (Lower Main A&B) for the Ender 3 (220mm X 220mm) and Bambu Labs (256mm X 256mm) build sizes.
Design constraints/issues/facts:
1. The design can only fit skinny fore-grips one the upper receiver, this is a product of front takedown pin reinforcement.
2. There is no buffer detent. So you have to hold it when you are putting the upper on the lower.
3. The safety install is a bit tricky, this is due to the integrated grip. A standard Safety Detent pin must be modified and the base flat needs to ground off. To remove the Safety Lever the 14mm screw will have be removed that will relieve the spring pressure, there is a little slit to help you fish out the spring.
4. It doesn't use standard takedown pins.
5. There is a buffer sacrifice disk to protect the plastic buffer tube from cracking, this can be attached to the buffer spring. Print this out of TPU
Printing Tips:
For Lower Main and Buffer:
0.16 layer heights.
3mm of wall (6+ layers)
20% infill
The Brace and Stock can be printed with thinner walls and a taller layer height for faster print. Buffer Sacrifice should be 100% infill and TPU.
Hardware required:
QTY 1: 1/4" Diameter 1-1/4" Useable length Flat-Head Quick-Release Pin McMaster: 90156A263
QTY 1: 1/4" Diameter 1-1/2" Useable length Flat-Head Quick-Release Pin McMaster: 90156A508
QTY 1: spacer 5mm thick x 1 inch( the buffer tube is 5mm long so a 5 mm spacer is required to prevent the top of the BCG from smashing into the buffer tube). There is also a STL file included if you want to print one (Printing it in TPU with100% infill recommended)
QTY 24: M3x0.5mm 20mm (long) Socket head screws McMaster:91292A123
(Note: the safety uses a single 14mm screw so use a 14mm McMaster:91292A027 or just cut down a 20mm screw)
QTY 24: M3x0.5mm Hex Nut McMaster:91828A211
QTY 1: M8 x 20mm Socket head screw 6mm Hex driver (for Stock and Simple Brace attach)
QTY 1: M8 nut (should be 1/2" across) (for Stock and Simple Brace attach)
QTY 2: KE-Arms KP-15 Hammer Pins (standard pins should work in a pinch)
QTY 1: KE-Arms Safety Detent Pin (or you can file off the bottom lip of a standard safety) Look at the KE-Arms website for what the Detent Pin should look like.
Duh section:
1 KE-Arms Safety Selector (a standard one can be used, but when removing the Selector, the Socket head screw in the grip must be removed first)
1 Standard bolt release hardware
1 Standard magazine catch hardware
1 trigger
1 buffer spring + buffer
LBRY Tags: ar-15; ar-15 printable lower; bump stock; 3d printing
Surprise Surprise... Well that's what I did, but I did it on my own lower.
This Ar-15 lower that was designed to be printed on an Ender 5 Plus or Creality K1Max (300mm X 300mm). However you can print the main body in two pieces attach them together. I have included pre-cut files (Lower Main A&B) for the Ender 3 (220mm X 220mm) and Bambu Labs (256mm X 256mm) build sizes.
Design constraints/issues/facts:
1. The design can only fit skinny fore-grips one the upper receiver, this is a product of front takedown pin reinforcement.
2. There is no buffer detent. So you have to hold it when you are putting the upper on the lower.
3. The safety install is a bit tricky, this is due to the integrated grip. A standard Safety Detent pin must be modified and the base flat needs to ground off. To remove the Safety Lever the 14mm screw will have be removed that will relieve the spring pressure, there is a little slit to help you fish out the spring.
4. It doesn't use standard takedown pins.
5. There is a buffer sacrifice disk to protect the plastic buffer tube from cracking, this can be attached to the buffer spring. Print this out of TPU
Printing Tips:
For Lower Main and Buffer:
0.16 layer heights.
3mm of wall (6+ layers)
20% infill
The Brace and Stock can be printed with thinner walls and a taller layer height for faster print. Buffer Sacrifice should be 100% infill and TPU.
Hardware required:
QTY 1: 1/4" Diameter 1-1/4" Useable length Flat-Head Quick-Release Pin McMaster: 90156A263
QTY 1: 1/4" Diameter 1-1/2" Useable length Flat-Head Quick-Release Pin McMaster: 90156A508
QTY 1: spacer 5mm thick x 1 inch( the buffer tube is 5mm long so a 5 mm spacer is required to prevent the top of the BCG from smashing into the buffer tube). There is also a STL file included if you want to print one (Printing it in TPU with100% infill recommended)
QTY 24: M3x0.5mm 20mm (long) Socket head screws McMaster:91292A123
(Note: the safety uses a single 14mm screw so use a 14mm McMaster:91292A027 or just cut down a 20mm screw)
QTY 24: M3x0.5mm Hex Nut McMaster:91828A211
QTY 1: M8 x 20mm Socket head screw 6mm Hex driver (for Stock and Simple Brace attach)
QTY 1: M8 nut (should be 1/2" across) (for Stock and Simple Brace attach)
QTY 2: KE-Arms KP-15 Hammer Pins (standard pins should work in a pinch)
QTY 1: KE-Arms Safety Detent Pin (or you can file off the bottom lip of a standard safety) Look at the KE-Arms website for what the Detent Pin should look like.
Duh section:
1 KE-Arms Safety Selector (a standard one can be used, but when removing the Selector, the Socket head screw in the grip must be removed first)
1 Standard bolt release hardware
1 Standard magazine catch hardware
1 trigger
1 buffer spring + buffer
LBRY Tags: ar-15; ar-15 printable lower; bump stock; 3d printing