[EscapisT]

Hey guys, I was testing my Umarex 416 today. It's almost fully custom built. Everything operates, but not smoothly. It feels like every time I fire the motor is clonking around inside the grip.

I tried running it with a piece of styrofoam (from a styrofoam dish) inside the frontside of grip to tighten the fit, but it doesn't help. The height is properly adjusted as I can barely hear the gears engaging. Also, the wires are routed behind the motor in the back of the grip.

Ever since I could remember I've always had this issue.. Every time I'd try out other people's m4's they felt much smoother than mine; All I would feel is the light vibration of the motor and the soft thump of the piston as opposed to the motor is bouncing and clonking around in the grip which makes my gun feel cheap and flimsy.

I was reseating the motor today, trying to fix it, and on the 5th attempt, I gave up.. Then I decided to fire it to test for heat (with a barrel plug, to simulate the compression of a BB in the barrel). The grip started heating up but the wires, connectors and battery remained cool. All normal.

Suddenly, it feel like it started to run smoother. Like the clonking gradually disappeared, and it did. It felt like it just magically "broke in". But, simultaneously, it also started making a screeching noise with every shot and got progressively worse. Turns out the cylinder did not have enough lube and the o-ring was sliding dry. The last thing I wanted to do at that point was take it apart now that I had it in that sweet spot. But I couldn't let the piston cycle dry. I re-lubed it and put it all back together and now the clonking is back.

This is soooo frustrating >:[