Nerf Caliburn U - Simplified Edition

thingiverse

CHANGE NOTE 05/01/20 - Enhanced installation ease for all hex standoff features. CHANGE NOTE 04/15/20 - Integrated MagBack and Pcap prints with modeled supports. CHANGE NOTE 03/06/20 - Updated rail segments with anti-rotation keys (credit Thanhtacles), matching features on muzzle and magfront, and numerous small changes to coupler, frontbutt, backbutt, and buttplate. CHANGE NOTE 12/21/19 - Replaced lock nuts with 4-40 hex standoffs. All related parts updated. CHANGE NOTE 12/7/19 - Added optional retrograde grip print. CHANGE NOTE 12/7/19 - Critical changes to Coupler, Frontbutt, Backbutt, and Buttplate. A reprint is highly recommended. CHANGE NOTE 11/30/19 - Added optional takedown functionality. CHANGE NOTE 11/21/19 - Updated hardware retaining features in most parts, added printable AR pistol grips, one with Caliburn features to accept grip inserts, added railgasm segments, and added widened AFG. This was an experiment in building a simplified Caliburn assembly without threaded rod. Features 1. Magazine loading from the top 2. Removal-Insertion of the magazine with the breech closed 3. All-Metal assembly with nested hex nuts 4. No twist or flex 5. U-channel provides alignment of all components during assembly 6. 20% lighter in total weight 7. 30% shorter total print time U-channels are made from 1/2" x 3/4" x 1/8" thick aluminum. Most of the assembly involves 4-40 x 3/8" length flat head screws and 4-40 nylon-insert lock nuts. All other hardware items except the AR15 pistol grip are standard Caliburn hardware items. Assembly Instructions: http://captainslug.com/nerf/CaliburnUAssembly1.pdf