[magicald_223]

I am trying to get my tooling together, I am finally gonna do it...I'm building my own Krink from a K-var kit. I don't have the kit yet, but I am ordering it this weekend (got to get paid first) anyway, I know that the kit has a virgin barrel and trunnion, so I will have to press it, headspace it, and drill the barrel pin. I know it is a little premature because I don't have the kit to mic. the barrel pin, but does anyone know what size bit is required and or the best type of drill bit to use?? Furthermore, anyone know just in general what the standard size difference you use for any type of press pins like for the FSB?

 

[hotbarrel]

global sells the standard size pin AND an oversize pin . I think if you check their sight out they give the size of both. also I think some differant issues come up if the trunion has not been allready drilled. if it has allready been drilled then you can size up a drill to the hole and if you do no drill out the other side you will only dig out the barrel and not alter at least one side of the trunion at all. If you are going to drill ware their is no hole at allI think you should stop a couple thousandths undersize with a drill and use a reamer for the final pass.

 

[scubadvr]

Global is out of the oversize pins. I made mine from drill stock. Check out MSC Jack

 

[mbadboyz]

Global is out of the oversize pins. I made mine from drill stock. Check out MSC Jack

If you can press out the old pin, can you install the new regular size pin? Or do you have to drill and use an over sized pin?

 

[7.62x39]

If you can press out the old pin, can you install the new regular size pin? Or do you have to drill and use an over sized pin?

You can use the standard pin as long as the headspace is correct.
If you need to adjust it, you will need to go oversize.

 

[magicald_223]

true about the oversized pin, its just with these kits, the barrel has never been installed. Also, it is 5.56x45 so I quess I should use 5.56x45 headspace gauges instead of .223 Rem?

 

[chargedmr2]

Here's what I came up with for the required drill bit and reamer sizes for a Krink build based upon my K-VAR kit. My pins were all approximately .002" larger than the final hole size. For example, the barrel pin hole should be exactly 7mm after it is reamed. My barrel pin measured 7.04mm which is .002" larger than the hole. This allows for a press fit that is within spec. Hope this helps.

Dimensions for 5.45x39 Krinkov Kit

Reamer Sizes Needed

? Barrel Pin Hole: 7mm (.2756?)

? Hinge Block Hole: 4mm (.1575?)

? FSB/GB Holes: 3mm (.1181?)

? Plunger Retainer Pin Hole: 2.5mm (.0984?)

? Front Trunnion Holes: 4.5mm (.1772?)

? Front Trunnion Hole: 4.0mm (.1575?)

? Hand Guard Slot: 5mm (.1968?)


Drill Bit Sizes Needed

? Trunnion Holes (4.5mm): 11/64th (.1718?)

? Trunnion Holes (4mm): 5/32nd (.1562?)

? Barrel Pin Hole: 17/64th (.2656?)

? Front Sight / Gas Block: 7/64th (.1094?)

? Hinge Block: 5/32nd (.1562?)

 

[magicald_223]

Thanks for the info Charged!!! Outstanding work!

 

[magicald_223]

Hey Charged, I should have done more searching before I posted, I saw your thread on ak-47.net forum...So how did you build turn out?? Barrel pin work???

 

[chargedmr2]

I decided to hold off on the build until global trades releases their 1mm receiver. I'm just not all that happy with the current options for receivers and I don't want to assemble a nice krink kit on a receiver that I'm not pleased with. I really want it to look authentic and global's new receiver is almost going to be an exact euro copy. It will have the x and y dimples, and all the good stuff. More importantly, it will have properly stepped rails meaning the bolt carrier will not have too much slop as with all of the current 1mm receivers. As soon as global has the product, the build is on!!