View Full Version : Flat Saved....

03-04-2010, 10:46 PM
almost.. :lolgreen:

Last year I tried to bench roll this flat and messed it all up, it was bent way off center and there was no hope of me fixing it. Well I got access to a mandrel and jig from a very kind fellow and before I tried to roll any of my new flats I thought I'd try to save this one.
Well I am almost satisfied with it, it has a fine layer of rust on it from being out in my shop, in a drawer for the last year or so but it ought to blast right off, no pits.
It still isn't perfect it needs a little more messaging, but it is probably close enough to build on. The bend is still a little off-center and I am going to continue trying to adjust it until I get it close to perfect.
Moral of this is if you mess something up, don't get mad, don't throw it away, put it away for a while think about it. :thumbup:




03-05-2010, 06:54 PM
looks good to me . keep us posted. :thumbup:

03-05-2010, 07:07 PM
Good advice Smokehouse69. I usually have a few build going at once, and at the same time gathering parts for other builds. Ina build if I get to a hard spot, get frustrated, or stuck in some way thats what I do. "put it away for a while think about it."
Good job on the save.:thumbup:

03-05-2010, 07:49 PM
Ditto on the let it rest and thinking it through. It still bothers me to put it down though, but it does help keep the self-inflicted problems low.

03-06-2010, 11:33 AM
Doesn't look like it's rolled wrong, looks like one side is flatter than the other, making one side taller than the other side. Put a straight edge from top center to bottom center and measure your distances from that center line out to the bottom of the rails. Or trace the profile outline on a piece of paper, cut it out and then flip it over against the back of the receiver, and compare the profiles,,,, that will usually show you where the bend went bad. I bet you'll find that one side is narrower than the other. If so, put a 3/4' rod in the charging tube , clamp just the charging tube in the vice and bend the flatter or tall side outward and or the shorter or wide side in to match up, then fold it back together again with equal bends on each side before you tack it together.
The roll usually goes bad at the crease at the bottom of the charging tube, they do not bend with the same amount of force or at the same angle on each side due to the port opening.

03-06-2010, 01:18 PM
You're right, I am going to work on it again this afternoon and try to even it out some more. The right side rail (ejection port side) is about an 1/8th inch higher when measured from the center of the receiver.

03-06-2010, 04:37 PM
Go by the width between the rails from vertical centerline, and check the profile, you will find that the crease under the charging tube on the left side, (opposite the port) is not bent as sharp as the one on the port side is, and that the left side profile of the receiver is flatter on the left side as well. Once your get that charging tube profile corrected and square your rails you will be a lot closer.

03-08-2010, 01:03 PM
maybe some of there tips may help you.






Finally conduct a test something like this.


Make certain the rails are placed correctly and level with the trunion first.


Hope this helps.

03-09-2010, 09:38 PM
I just went through your complete thread over CalGuns and I have to say that it is the most complete and detailed set of instructions I have ever seen on building an HK type firearm! :thumbup:

03-10-2010, 08:37 PM
Thank you. Work in progress, almost done though. Will be blasting and parking by the end of the month.

I just went through your complete thread over CalGuns and I have to say that it is the most complete and detailed set of instructions I have ever seen on building an HK type firearm! :thumbup:

03-16-2010, 12:20 AM
Yeah... fredies post is awesome!