M1887 custom nerf shells

Created a selection of custom shells for the M1887 blaster that fires 3/4 length nerf darts as standard.

Ranger5 - This is similar to the original shells that came with the blaster, but with snug dart fit for its whole length to up the performance slightly. If you're printer settings are spot on the internal bore will be 12.7mm, which I've found to work the best for most darts.

Brass5 - Similar to Ranger5, but designed to have a length of 17/32 brass fitted once printed. This will slightly improve performance further.

Ranger6 - A shortened version of Ranger5 that's designed to give you six round capacity in the magazine, over the stock 5. It is designed for half darts only.

Brass6 - Similar to Ranger6, but designed to have a length of 17/32 brass fitted once printed. This will slightly improve performance further. Again this is for half darts only.

Ranger6spacer - This is a spacer that needs to be inserted into the breech and carefully pushed into place with one of the s