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Posted: 4/26/2017 3:15:19 PM EDT
It appears Moore Advanced Dynamics (MAD) has re-engineered the MP5 bolt to remove what I consider it's weakest link, the extractor spring.

I read that Battlefield Vegas (@hendersondefense) is running a few in their rentals and so far so good. Does anyone else have any reviews on them. I am on the verge of ordering one for my full auto K, but $479 is a tough pill to swallow an thats a lot o' extractor springs.

New


vs.

Old


https://www.centerfiresystems.com/p-5251-mad-9mm-mp5-bolt-head.aspx
Link Posted: 4/26/2017 8:29:57 PM EDT
[#1]
bump
Link Posted: 4/26/2017 8:33:57 PM EDT
[#2]
Interesting, reminds me of the HK PSG-1 bolt/extractor setup. Hk realized the extractor was an issue for precision shooting and solved it for the PSG-1 sniper rifle. 
Link Posted: 4/26/2017 8:54:52 PM EDT
[#3]
OS Tag
Link Posted: 4/26/2017 9:29:53 PM EDT
[#4]
Looks a LOT like a 23 bolt head.

Link Posted: 4/27/2017 9:19:52 AM EDT
[#5]
I love the design.   I'd bite in the mid 2's but not where it's at now.
Link Posted: 4/27/2017 9:55:03 AM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I love the design.   I'd bite in the mid 2's but not where it's at now.  
View Quote
When you factor in the cost of a new regular bolt head, its only in the mid 2's more expensive.
Link Posted: 4/27/2017 4:38:01 PM EDT
[#7]
I simply haven't had enough problems with the original design to warrant the money.
Link Posted: 4/27/2017 5:23:16 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I simply haven't had enough problems with the original design to warrant the money.
View Quote
cause your not shooting enough!
Link Posted: 4/28/2017 7:19:49 AM EDT
[#9]
A good idea thats priced itself into oblivion.
Link Posted: 4/28/2017 11:37:37 AM EDT
[#10]
Yeah, I'd be interested, but it's priced way too high IMO.  I understand that anything MP-5 ='s a larger price tag but geez.  This is as bad as Franklin Armory's $700+ dollar binary trigger pack...

Give us a break guys.
Link Posted: 5/11/2017 11:57:04 AM EDT
[#11]
bump
Link Posted: 5/11/2017 3:35:43 PM EDT
[#12]
Link Posted: 6/18/2017 5:00:33 AM EDT
[#13]
Would this work with a DJ Getz MP5 clone? Full Size and K.

I've gone through a few extractor springs...
Link Posted: 6/18/2017 8:16:40 AM EDT
[#14]
Link Posted: 6/18/2017 9:12:42 AM EDT
[#15]
These bolt heads warrant additional cost. The design has been tested above and beyond the normal failure tests. RCM manufactures these bolt heads for MADD. We have worked with them since day one and believe this is the next generation bolt head.
Link Posted: 6/18/2017 10:13:41 AM EDT
[#16]
I could do $299 if I hadn't just bought a brand new F Bolt.
Link Posted: 6/18/2017 3:17:42 PM EDT
[#17]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Yes they will work with the Getz clones , Battlefield Vegas is running some of our Omega clones and said with the MAD Bolts they just could not be stopped. So we decided to order some in and they are very nicely machined . I think they are going to be listed for 299.00.
View Quote
If you know where they're $299, please post a link. Inquiring minds want to know?

Link Posted: 6/18/2017 3:54:57 PM EDT
[#18]
Link Posted: 6/18/2017 7:46:23 PM EDT
[#19]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


If you know where they're $299, please post a link. Inquiring minds want to know?

http://i225.photobucket.com/albums/dd154/UltraFudd/SP5K%20SBR%20Right%20View_zpsd9lgtwtd.jpg
View Quote
Dude, the big roller lock dealer says that they're going to list them for $299... it's pretty obvious where you'll want to look for them.
Link Posted: 6/18/2017 8:04:37 PM EDT
[#20]
Interesting... Any pics of one of these disassembled? How do you disassemble it? How does the extractor spring fit into the works? Is it a coil spring? Will replacement parts be available?

So many questions...
Link Posted: 6/18/2017 10:27:36 PM EDT
[#21]
The extractor has a US made Spirol Coil Spring that is pressed in from the bolt face. If the picture shows, the pin will expand back out when it passes through both sides of the bolt head and the extractor itself. The exposed  pocket will be radiused on the backside to allow the pin to be punched through if necessary and exit up the ramp created by the radiused pocket.
Link Posted: 6/18/2017 10:29:29 PM EDT
[#22]
All new features have been added after the testing at battlefield
.
Link Posted: 6/18/2017 10:50:46 PM EDT
[#23]
tag for pictures
Link Posted: 6/19/2017 8:42:15 AM EDT
[#24]
The link in OP price is down to $329.

So is there going to be a Gen2 of these now with improvements based on BF Vegas?
Link Posted: 6/19/2017 9:50:59 AM EDT
[#25]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The link in OP price is down to $329.

So is there going to be a Gen2 of these now with improvements based on BF Vegas?
View Quote
because the $479 price is ridiculous and insane.

Hell, $329 is a bit ridiculous.
Link Posted: 6/19/2017 9:52:05 AM EDT
[#26]
$299 is getting better, but a $199 price tag would be more fitting.
Link Posted: 6/19/2017 8:11:05 PM EDT
[#27]
Link Posted: 6/19/2017 8:28:40 PM EDT
[#28]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
$299 is getting better, but a $199 price tag would be more fitting.
View Quote
Agreed. I want one (okay, three), but not $300 want. Looks like nice improvement.
Link Posted: 6/19/2017 9:53:54 PM EDT
[#29]
This may sound dumb, yet I have to ask, will these bolts drop in? Any headspace necessary or change of bolt rollers?

And I'm asking specifically for Getz guns. Thanks in Advance
Link Posted: 6/19/2017 10:08:58 PM EDT
[#30]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
This may sound dumb, yet I have to ask, will these bolts drop in? Any headspace necessary or change of bolt rollers?

And I'm asking specifically for Getz guns. Thanks in Advance
View Quote
I believe there is always a possibility the Bolt Gap changes but these should be drop in.  My only experience was swapping out an MKE bolt for an F bolt and the gap stayed exactly the same.

At this point, I am going to stay happy with my current German bolt and backup MKE bolt.  Really don't ever see wearing one out, let alone 2.
Link Posted: 6/19/2017 10:20:57 PM EDT
[#31]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I believe there is always a possibility the Bolt Gap changes but these should be drop in.  My only experience was swapping out an MKE bolt for an F bolt and the gap stayed exactly the same.

At this point, I am going to stay happy with my current German bolt and backup MKE bolt.  Really don't ever see wearing one out, let alone 2.
View Quote
This isn't about wearing out the bolt, it's about fixing the weakest link in the MP5 platform, the extractor spring. This would also allow people you use steel cased ammo more reliable as well.
Link Posted: 6/20/2017 12:39:16 AM EDT
[#32]
My concern would be availability of extractors down the road.
Link Posted: 6/20/2017 8:16:37 AM EDT
[#33]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


This isn't about wearing out the bolt, it's about fixing the weakest link in the MP5 platform, the extractor spring. This would also allow people you use steel cased ammo more reliable as well.
View Quote
Man, I am trying to convince myself I don't need this thing!

But I agree, this is something H&K should have done instead of the F Bolt, for reliability reasons. In general, everything I own I want to be bump in the night reliable, but after my Z-5P has choked on some 147gr flat points and HP (Mostly 1 mag, although had issues with a German mag as well) I am kinda leaning towards it being a fun/range toy.

Recently it has run my Win Ranger a few mags without hiccups. If I can get through the next 500 rounds trouble free I may consider selling my F bolt and getting one of these.
Link Posted: 6/30/2017 11:43:51 AM EDT
[#34]
I own a MAD 33AR myself and its my favorite pseudo assault rifle to shoot even ACOG worthy. Should such a bolt head come out for the 33 series I will probably cave and buy one.
Link Posted: 7/9/2017 8:08:12 PM EDT
[#35]
well hell I ordered one for the shop MP5. We will run it through the paces and see how good it is. Nothing like battlefield vegas though.
Link Posted: 7/13/2017 7:55:36 PM EDT
[#36]
Got the bolt today and installed. Ran a couple of mags through it. It ate everything including the steel cased wolf shit that it normally wouldn't eat at all.

I will go to the range sat AM and run it through the paces. So far though, I am impressed.
Link Posted: 7/14/2017 8:42:06 PM EDT
[#37]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Got the bolt today and installed. Ran a couple of mags through it. It ate everything including the steel cased wolf shit that it normally wouldn't eat at all.

I will go to the range sat AM and run it through the paces. So far though, I am impressed.
View Quote
It's pretty hard to take a gun as old as the MP5 and make it better like this, but these guys really did it. I've shot their entire line of guns at their facility and they make some seriously great full autos.
Their guns outran HKs demos at shot last year. Thats not a joke. That actually happened.
Link Posted: 7/14/2017 8:53:09 PM EDT
[#38]
Impressive! 
Demos of what? MP5 vs. MP5?
Link Posted: 7/14/2017 10:15:17 PM EDT
[#39]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Impressive! 
Demos of what? MP5 vs. MP5?
View Quote
It was a closed range day pre-SHOT for LE and .mil demos. It was before they officially released the new bolt head. They were in the guns already but none of the shooters knew it.
The HK rep asked them what they were doing to get the guns to run so well That's how you know you've got a winning idea.
Link Posted: 7/17/2017 2:37:29 PM EDT
[#40]
Well I managed to put over 700 rounds mostly full auto with the new bolt on Saturday.

Ammo used was mostly wolf, tula, Prvi, and some federal brass.

The gun ran great, with only a 5'ish stove pipes. Simple charging and shaking the casing out.


I am impressed and would highly recommend one of these if you do a lot of shooting or have a trigger pack.
Link Posted: 7/22/2017 11:42:52 PM EDT
[#41]
Put another 200 rounds through it this evening, all FA wolf steel cased with only 1 failure.
Link Posted: 8/23/2017 4:11:02 PM EDT
[#42]
Any more updates or feedback?
Link Posted: 8/23/2017 4:33:57 PM EDT
[#43]
I believe that they have begun testing a 40 S&W / 10mm version of the bolt head.
Link Posted: 8/23/2017 4:37:22 PM EDT
[#44]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Any more updates or feedback?
View Quote
Well it works if thats what you are asking.

I had a few light primer strikes on a different full auto gun, but thats the only malfunctions I have seen with it.
Link Posted: 8/23/2017 6:33:35 PM EDT
[#45]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Well it works if thats what you are asking.

I had a few light primer strikes on a different full auto gun, but thats the only malfunctions I have seen with it.
View Quote
Just wanted to see if they were still going strong or any issues popped up.
Link Posted: 8/24/2017 7:44:25 AM EDT
[#46]
Link Posted: 10/29/2017 7:13:40 PM EDT
[#47]
probably  800 rounds of tula 9mm thru dakota mp5kn  no problems;   could not get thru a mag of the stuff before.
Link Posted: 10/29/2017 10:19:51 PM EDT
[#48]
duped
Link Posted: 10/29/2017 10:20:38 PM EDT
[#49]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Just wanted to see if they were still going strong or any issues popped up.
View Quote
I've got one as well you can try the next time we're together at the range. Ran 120 rounds 124g NATO through the SD w/o a single problem.
Link Posted: 10/30/2017 12:18:39 PM EDT
[#50]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I've got one as well you can try the next time we're together at the range. Ran 120 rounds 124g NATO through the SD w/o a single problem.
View Quote
Did your paperwork get approved on both of your HK's? I have been so busy that I have not been out in awhile.
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