Lego M4 Carbine

At heart, this used to be a Brickarms ARC.

 

The magazine and scope are removable. I show the weapon here in one of my favorite configurations.

 

Now Fingers-Blow asked for what I did, so here's my overly lengthy, somewhat unnecessary list of steps.

 

It may help to have a picture of, or be holding, a BA ARC while you read this.

 

First, removed scope, magazine, stock, and forward sights/barrel (including clean removal of the little rectangular bit at the base of the scope)

Cut off handle (it is improperly angled on the BA ARC)

Heavily filed down both sides of receiver, and sculpted entirely new details onto the now realistically-thin receiver

Re-attached modified handle at appropriate angle

Cut RIS lines into the proper surfaces

Drilled in thin brass rod and sculpted a new barrel on it (the barrel is very stable)

Created new forward sight and attached it

Attached MinifigCat HK416 stock, home-made foregrip

Drilled appropriately placed holes in magwell and the top of the receiver to accommodate interchangeable magazines and sights

 

I think that about covers it. I took advantage of the fact that the BA ARC's RIS parts are the same size as Tiny Tactical's RIS parts, so scopes are added via brass rod (attached inside the scope and inserted into the hole on top of the gun) and stay at the right angle since their TT sides sort of grip the BA RIS.

Not anywhere near how real RIS works, but hey, I like the function.

 

Hope you enjoy, and understand most of the esoteric terms in the gun explanation.

Done