I'll go first. I recently (as in last night) built the mod of Jager's rifle from THIS IBLE and found the gun a bit faulty. Since it uses a lot of pieces, I was in no rush to dismantle it immediately, and rather, I tore its insides out and put my own in. The result is an enormous mod of a mod with a four-shot magazine for orange connectors with grays and a sleek look similar to the original mod.
P.S. The picture is from a bad lighting/angle... the gun looks a lot cooler in person.