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Old 04-27-2013, 04:42 PM   #1
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Default us trunnions *success*

I made some front trunnions
4th axis op

small feature differences but critical dimensions are perfect.

Still need heat treat and testfire. Im sure theyll run perfect.

Last edited by tortort; 05-26-2013 at 01:02 AM.
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Old 04-27-2013, 04:46 PM   #2
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Very very cool. Are you producing these just for you, or planning on marketing them retail?
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Old 04-27-2013, 04:49 PM   #3
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Make some 19mm ones and youll be rich.
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Old 04-27-2013, 04:49 PM   #4
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Very nice op! I'm sure if the price is right, you can make a killing on these!
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Old 04-27-2013, 04:53 PM   #5
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Make some 19mm ones and youll be rich.
+1 Lots of 19mm chi-com kits languishing out there.
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Old 04-27-2013, 04:53 PM   #6
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Going to mass production. Check the market place with a testfire video soon.
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Old 04-27-2013, 04:54 PM   #7
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If you want a 19mm send me a sample and Ill make it
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Old 04-27-2013, 04:55 PM   #8
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Ive never seen a 19mm in real life. Bullet guide is machined on those?
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Old 04-27-2013, 04:56 PM   #9
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Going to mass production. Check the market place with a testfire video soon.
Great news.
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Old 04-27-2013, 04:58 PM   #10
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While you're at it, can you fabricate chinese spiker front sight bases? Tats another hot money.
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Old 04-27-2013, 06:17 PM   #11
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Excelent!...now incorporate the the rear trunnion in a milled receiver non-ffl "shell" with no axis holes and let us drill them with an akbuilder drill jig.PSL length milled shells would be the schiznit
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Old 04-27-2013, 06:20 PM   #12
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Foreign trunnions are $75-99. What'll your price point be?
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Old 04-27-2013, 07:10 PM   #13
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Foreign trunnions are $75-99. What'll your price point be?
Find me some $75 to $99 trunnions in quantity.

They're not out there right now.

I've sensed that the sweet spot for quality us parts is $125 to $150. And I'll gladly pay that.

OP: What steel are you using? What's the spec on an AK for hardness of the front trunnion?
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Old 04-27-2013, 08:02 PM   #14
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Quote:
Originally Posted by GonzoAKM-1 View Post
Find me some $75 to $99 trunnions in quantity.

They're not out there right now.
apexgunparts.com
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Old 04-27-2013, 08:05 PM   #15
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Shit man make some PSL barrels, they would fly out the door.
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Old 04-27-2013, 08:10 PM   #16
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apexgunparts.com
I see bulgarian 5.45 front trunnions, polish tantal 5.45 front trunnions, and yugo m85 .223 front trunnions...

Not seeing anything in 7.62... I scanned through all the sections and did a search too....
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Old 04-27-2013, 08:30 PM   #17
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Quote:
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While you're at it, can you fabricate chinese spiker front sight bases? Tats another hot money.
+1
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Old 04-27-2013, 08:43 PM   #18
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G'dam nice pieces!...the 7.62 FT's are all but dried up...BMA has them w/o bullet guides on them for $99, but i'd gladly pay a lil extra coin for a NEW USA bit for a build thats gonna have a new bbl on it anyway...
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Old 04-27-2013, 08:50 PM   #19
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Originally Posted by GonzoAKM-1 View Post
I see bulgarian 5.45 front trunnions, polish tantal 5.45 front trunnions, and yugo m85 .223 front trunnions...

Not seeing anything in 7.62... I scanned through all the sections and did a search too....
They must have sold out. They used to have em' all day long.

Sign of the times...
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Old 04-27-2013, 09:53 PM   #20
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Quote:
Originally Posted by GonzoAKM-1 View Post
Find me some $75 to $99 trunnions in quantity.

They're not out there right now.

I've sensed that the sweet spot for quality us parts is $125 to $150. And I'll gladly pay that.

OP: What steel are you using? What's the spec on an AK for hardness of the front trunnion?
4140 steel.
I read hardness is between 42-50 Rc.
Heat treat is holding things up. I'm having the original (AMD) tested.
If anyone has info on that,please share
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Old 04-27-2013, 09:58 PM   #21
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With all the export restrictions and importers charging more and more $$ the market is ready for a USA producer of AK parts..

parts look very nice, good luck with R+D !!
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Old 04-27-2013, 10:04 PM   #22
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I don't get impressed by much.........but this.......

Very impressive.
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Old 04-27-2013, 10:19 PM   #23
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I don't get impressed by much.........but this.......

Very impressive.
I would agree. I don't think many would attempt it. Hats off to you man
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Old 04-27-2013, 11:09 PM   #24
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Default Heat treat

Quote:
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4140 steel.
I read hardness is between 42-50 Rc.
Heat treat is holding things up. I'm having the original (AMD) tested.
If anyone has info on that,please share
I don't know where your located but you can get 60 Rc with Ion Plasma Nitride Process and it won't change the size or shape. Machine them complete and send them to Eltro Service in Oxford Michigan. You will get a case hardness of .030 on 4140. I plan to do the inside of my barrels instead of chrome. Just my $0.02. Ps - that is nice work!
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Old 04-28-2013, 12:15 AM   #25
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Now I just need some kits . BTW any plans on making some krink / tula copies with authentic markings?
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Old 04-28-2013, 06:59 AM   #26
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Quote:
Originally Posted by tortort View Post
4140 steel.
I read hardness is between 42-50 Rc.
Heat treat is holding things up. I'm having the original (AMD) tested.
If anyone has info on that,please share
Properly hardened Galil receivers are 43 HRC, I believe the drivers are bolt lugs and ejector.
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Old 04-28-2013, 07:17 AM   #27
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Tortort - looking good there. The basic internal shapes are the most serious challenge with this part. Hopefully the bore remains true through the heat-treatment process and does not require i.d. grinding.

I appreciate you stepping up to the challenge!
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Old 04-28-2013, 08:56 AM   #28
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Pretty excited for this. Just getting ready and buying parts for an 47 build and was asking on another forum if there was a US front trunnion and they sent me here! Getting excited to see prices and when these could be available!
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Old 04-28-2013, 09:25 AM   #29
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Unlike the rear "trunnion" this part will count as one (01) part to fulfill the 922(r) requirement. There's another plus
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Old 04-28-2013, 09:39 AM   #30
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Quote:
Originally Posted by cgp View Post
While you're at it, can you fabricate chinese spiker front sight bases? Tats another hot money.

Yeah I think a lot of people would like to buy Chinese front trunnions and spiker sight bases.
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Old 04-28-2013, 10:13 AM   #31
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Yugo front trunnions would be great as well
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Old 04-28-2013, 11:20 AM   #32
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Thanks guys.
Wont be satisfied til after testfire.

Rforbus,
If it shrinks or oblongs i figure load it in a vice and .0001 indicate for finish bore. Theyre .9055 on the sunnen bore guage right now.
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Old 04-28-2013, 11:42 AM   #33
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Quote:
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Thanks guys.
Wont be satisfied til after testfire.

Rforbus,
If it shrinks or oblongs i figure load it in a vice and .0001 indicate for finish bore. Theyre .9055 on the sunnen bore guage right now.
Great plan. From what I observed most of the eastern European blocks are just bored before heat-treatment and do not appear to be finished afterwards. One can tolerate a bit of out-of round since they will move a bit and conform to the barrel journal - it obviously works. How much? Don't know - maybe 0.0003" or so TIR.

As far as I know only the Yugoslavians finished the bore by precision grinding afterwards. There may certainly be other countries that did but not from what I have seen.

I think you are going to have a real winner with these blocks - especially since you have the internal cuts figured out. With the basic internal model correct you will be able to duplicate everything out there. Good job!
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Old 04-28-2013, 03:36 PM   #34
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Quote:
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Going to mass production. Check the market place with a testfire video soon.
I love Made in USA stuff. Looking forward to seeing Video and how to buy one.
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Old 04-28-2013, 04:29 PM   #35
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Interested to see how this plays out. A high price point, say in the $100-$150 range, will be predicated on the continuation of this current dry spell. If a few thousand AKM kits hit the beach (unlikely, but not impossible) the price will go way down. Good luck to you.
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