Got Uzi

BPP HK23EK feeding issues

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19 posts in this topic

Picked this gun up yesterday and from the looks of it, the gun was hardly used....well I’ve figured out why I think.....

The gun will not go into battery when dropping the bolt on a round being fed out of a belt. Here is what I’m using-

Wolf 55gr steel case

new M27 SAW links from AmmuntionStore.com

Ive had the gun apart all day going over the little fine details as I’ve found a few burrs and high spots where the finish was pretty thick causing bolt drag.  I’ve addressed these issues and that’s all. That being said-I’ve discovered that the bolt assembly is stopping at the exact same spot each time and as soon as I release the feed mechanism, the bolt goes home. The gun is a BPP but it has a MM23E feed box (which I found odd) There is something binding up the gun when it tries to cycle the feed wheel in the feed box assembly.  I was able to get the gun to cycle 3 rounds flawlessly with no links, just placing the rounds on the feed wheel and then cycling the bolt.

Can someone point out what is going on and what I’m missing? At this point it seems like the bolt is hanging up on the links but I can’t tell how or where. Can the links be too large or the radius goes around too far and comes up through the feed way cover? I’ve wanted one of these guns for a long time and now that I got one I’m pulling my hair out. 

 

 

 

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IIRC my buddy had issues with his MM23 similar.  Turns out it would only run brass ammo and steel case would not feed and the gun was finicky even with some brass.   Are you using the laquer coated or the slippy coated cases (which I don't think have been around for a while, but I'm no Woof expert?)?  He ended up getting rid of it, since he is neither a gunsmith nor a tinkerer. 

Lots of guys here have experience with the 23 system and I'm sure will offer better advice.  My only time is on my 21e.

223 beltfeds have all sorts of issues.  I recently redesigned and MGA SAW to work.  So far the shrike has been dependable and trouble free, but I did build my own feedway parts for it which I think helped a lot.

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It’s non coated wolf. I was talking to a fellow 23EK owner last night and we might have narrowed it down-the lifter/detente has been ground to hell causing the round to “roll” out of position which is in turn allowing the link to come up through the top cover. The bolt is hanging up on the link so this is a good place to start working. Gonna call and order said part today and see what happens then. 

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Mine is marked in red, my buddies is marked in blue-see the difference. I got a feeling this is a lot of the issue

1CA54665-B355-42A2-BA3C-FC582E49EC9F.jpeg

C0AA35A2-F8EA-432F-9D71-17AEC5786D12.jpeg

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I'm sure a quick call to Carlos or MM would help.

 

I just looked at my belt feed (MM) unit and it looks just like yours (in red) and have zero issues. 7k rounds of .223

Good luck, keep us posted.

Edited by har1690

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Called and left a voicemail with Mike since it’s his feed mec. I’m also wondering if I could have a bent feed cover that’s allowing the link to sit higher in the slot. If it’s bent-it could allow the slot to have become wider, allowing more of the link/round combo to sit protrude out. Just a thought on it. I’m sure I’ll get this figured out, but I just really really want to light up some expensive .223/5.56

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One other thing I would recommend. When speaking with Mike, he always told me to use 62grain M855 only as the belt guns need correct/hot ammo. He said he always had issues with 55 grain and steel case ammo, I have an HK23E and was at a shoot last year and one of the guys had a MM gun. He was having issues, he was running 55 grain ammo and we used a belt of mine and it ran great. 

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This might be a better way to put my issues per what I sent Mike

Feed mec out of the gun-functions fine
Feed mec on bench-functions fine
Feed mec in gun/no ammo-functions fine
Feed mec in gun/3 rounds set on wheel-functions fine

Feed mec in gun/linked ammo, gun locks up on forward stroke in the exact same point each time

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5 hours ago, forkauto said:

One other thing I would recommend. When speaking with Mike, he always told me to use 62grain M855 only as the belt guns need correct/hot ammo. He said he always had issues with 55 grain and steel case ammo, I have an HK23E and was at a shoot last year and one of the guys had a MM gun. He was having issues, he was running 55 grain ammo and we used a belt of mine and it ran great. 

Thats because he feed mech sucks, he will blame ammo, links, etc

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3 hours ago, Got Uzi said:

This might be a better way to put my issues per what I sent Mike

Feed mec out of the gun-functions fine
Feed mec on bench-functions fine
Feed mec in gun/no ammo-functions fine
Feed mec in gun/3 rounds set on wheel-functions fine

Feed mec in gun/linked ammo, gun locks up on forward stroke in the exact same point each time

He will blame everything on the BBP gun, doubtfull he'll help u

Edited by taylorwso

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6 hours ago, Got Uzi said:

Called and left a voicemail with Mike since it’s his feed mec. I’m also wondering if I could have a bent feed cover that’s allowing the link to sit higher in the slot. If it’s bent-it could allow the slot to have become wider, allowing more of the link/round combo to sit protrude out. Just a thought on it. I’m sure I’ll get this figured out, but I just really really want to light up some expensive .223/5.56

Go read this

https://www.hkpro.com/threads/bpp23ek-2-5-year-range-report.215419/

see if you have any of the same problems.

 

I probably have more time fixing/breaking parts than most people. I've also help a lot of people with theirs, Im not a expert but I can make it work.

before any says anymore about wolf/steel, it will run just fine in a 23eK, saw or 21e with 23e feed mech.

The  MM feed mech and BPP gun are prob the worst 2 combos to use. Since its was without a BPP mech, I bet somebody has already been fucking with this gun,and just got rid of it. I have found MM feed mech wont run/fit in a real 23e but BPPs do. I also know that a BPP will runa a HK feed mech both 21 and 23

Are you running f/a? If so was the bolt/carrier fitted to the trip? if not the trip will bind. What bolt carrier/bolt?

look at the top of the feed mech/bullet feed on the right side, is it hitting the carrier? My BPP cartridge guide had to be taken down/ sanded to clear the  carrier- couple thousanths. Look at the 4-5th picture right under the calipers on the right side you can see the shiny metal.

See if it will charge w/o the feed mech but with the trigger pack. if it binds it could be the 23e ejector on the left with not enough clearance (trigger pack not fitted correclty) or the trip if using f/a.

if it charges with the trigger pack and w/o the mech see if it will close w/o ammo. If not see where its hanging up.

Is there any damage to the rounds being fed, or is it not getting that far.

 

IM me and we can talk.

 

 

 

 

 

 

 

 

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6 hours ago, Got Uzi said:

Called and left a voicemail with Mike since it’s his feed mec. I’m also wondering if I could have a bent feed cover that’s allowing the link to sit higher in the slot. If it’s bent-it could allow the slot to have become wider, allowing more of the link/round combo to sit protrude out. Just a thought on it. I’m sure I’ll get this figured out, but I just really really want to light up some expensive .223/5.56

dont fucking do that until you know whats wrong.

That guide is hardened and if you bend/grind it you'll fuck it up

 

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10 hours ago, Got Uzi said:

Mine is marked in red, my buddies is marked in blue-see the difference. I got a feeling this is a lot of the issue

1CA54665-B355-42A2-BA3C-FC582E49EC9F.jpeg

C0AA35A2-F8EA-432F-9D71-17AEC5786D12.jpeg

yours looks more correct that the canoe on the bottom.

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17 hours ago, taylorwso said:

Thats because he feed mech sucks, he will blame ammo, links, etc

I cant disagree with that. Now I have a actual HK 23E/21E combo built by Dyer and it runs like a Timex

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I’m closer to the end result. Found the trunion had a tight spot where the bolt was hanging up. I added just enough clearance where the bolt head passes through from the rails to the trunion. 

Now that I have it cycling and firing (test fired it finally) 

A new issue has come to my attention that I wouldnt have known until it was firing-the plunger that rides in the feed advance slot on the bottom of the bolt carrier is popping out after 2-3 rounds. Someone ground on it and it’s now short and not staying in the slot. Easy enough fix as I’ll be picking up a piece of drill rod tomorrow at work. One step closer to a fully functional weapon.

Edited by Got Uzi

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It’s been a long week of working on this gun but it was worth it

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Glad to hear you got the gun running but really buying 5.56 in 2021? 

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I’ll be running what I bought in 2018/2019

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