Pressed on with a .005 pressfit and pressed against the trunion face and pinned with two pins.
So let me get this straight ..........the 2" block has a 1" hole bored through her.....is it a slip fit around the barrel or is it pressed on?
Just the two pins holt it on no welding or anything attaching it to the trunion its just pressed tight against it and pinned
And how is the 2" block attached to the front trunnion ? Just the two pins you mentioned? ... Any bolts? ... Weld?...anything??
Its on the barrel but its tight against the trunion In fact I lapped the two parts together so there was 100% contact. MY therory is the mount cant move much with the barrel since its tight to the trunion and that the barrel would be free floating forward of the trunion.
Im having a hard time following what your writing ,but it doesn't really sound like the front mount is "bouncing around" with the barrel though.... rather more like you've effectively 'lengthened' the front trunnion , which is an idea I'd been tossing around in my head for awhile as well.
If you took the red part of your drawing and ran a rail back from it over the reciver 5" and didnt tie the mount to the trunion in any way you would have basicaly the same set up I have. if it was a press barrel build and it was pinned thight against the trunion face it would be Identical.
Im working on a switch barrel set up (there is a thread in the AK build forum here called my sons switch barrel ak) and Im thinking of a mount very simular to what you drew but I might some how mill the trunion so it will interface the mount and hold it when the barrel is unscrewed. I plan on using a barrelnut/jam nut like a savage bolt action. basicaly I will sandwich the mount between the trunion and the nut tightly fitted some how.
Yea and no loctite as I keep pulling it apart to mess with this or that. it has never come loose. not only are the screws supporting the recoil there holding up around 8 pounds of 26" long barrel and scope that is unsupported by hand guard or anything. I shoot pretty hot loads as well. the rear trunion is crossbolted and has nuts on the other side. this build was made to be taken apart and to be test bed for other stuff. It wasent made to be pretty I went 24 hours with out sleep the last day I built it to be done in time for a Pdog hunt.
And BIGGUN....3500 + rounds on a screw-build AK ??!!??
I put a reinforcement plate in inside the reciver with threaded holes I installed the butcherd Saiga fore grip into the reciver like normal and then ran A milled aluminum plate under the foregrip to add support. I really didnt have time to do any thing differant.
Cool, it's free floated? Here I just thought you were being very consistent in gripping the rifle. Mind posting pics of the brackets to hold the handguard, I've thought of something involving a tube welded to the front trunnion that goes around the barrel with 1/8" of clearance for the barrel, and boring out the handguards enough to fit over the tube, and making a new retainer to fit over the larger diameter tube. It would also allow usage of the stock sling location, but the scope mounting on the reciever wouldn't work too well as the front trunnion would be easily moved a little bit from force on the sling attachment point.
a easy way to get a floaating fore end would to just use a amd fore end and bolt it to the reciver or weld it for that matter just leave the end cap over size. I am going to use a round tube next time and incorperate it into the reciver some how. a extnsion that slid in under the trunion could be used. The gas tube just lays in a slot on the gas block I made . the next GB will be aluminum with a stainless sleave. I have a 2.5" tight fitting bore on that one for the piston to run in try to reduce part size. Im not sure I gained much and may just go more traditional next build. That blaoc is way to heavy and bulky but given the time frame it as all I could do. It works so I leave it be.
asthetics was not a concern on this build it was all about funtion and accuracy. I never really expected it to be as good as it was. I need ore horsepower now for those 1000 yard shots and much much better optics.