Moore Advanced Dynamics MAD MAX MP5 Bolt Head

Weak or fatigued extractor springs can effect proper case removal in the Heckler and Koch MP5/roller lock rifle platforms. And the only real remedy is to have several spares on hand in case the installed spring starts to go south. However, Moore Advanced Dynamics (MAD) has developed the MAX Bolt Head to address reliability issues in semi and fully automatic guns.

The unit has been tested to 100,000 rounds with far fewer extractor related malfunctions as opposed to their spring counterparts. The MAX is made from 9130 steel, is heat treated and uses no MIM parts.

I’ll definitely be investing in this MAD invention once my TPM Outfitters MP5SD finally clears ATF purgatory.

Moore Advanced Dynamics (MAD) MP5 Bolt Head:


The H&K MP5 has a long history of reliability, service & precision. One issue has repeatedly affected the MP5, failures to extract due to a weak or bent wire extractor spring. Moore Advanced Dynamics (M.A.D.) introduces the Moore Advanced X-tractor (M.A.X) to address those issues. The M.A.X. drop-in bolt head fits all existing roller lock MP5 style pistols & rifles. It has proven to increase function and reliability in semi & full auto weapons.

These have been extensively tested @ well known Full Auto ranges like Battlefield Vegas with our Omega line and have proven to be almost unstoppable . If you are looking for more time on the target with your MP5 then you may want to consider the MAX Bolt head for your Arsenal . Please see the spec sheet below for more info .

MSRP:$325 + Shipping $7.99.00 VIA USPS Priority Mail

$299 @ AtlanticArms

Moore Advanced Dynamics

As a comparison, here’s a standard Bolt Head c/o


LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Twitter: @gunboxready
Instagram: @tfb_pete


  • Giolli Joker

    Do we have some photos of the original assembly to compare?

    • Pete – TFB Writer

      Good idea. Hit refresh.

  • Dr. Longfellow Buchenrad

    They do have a clever name.

  • Mike N.

    Not owning an MP5 or clone, how much of a problem is this? I thought the guns were pretty reliable. $300 is a lot for a ~$1,500-$2,000 gun.

    • PK

      If you run matches, it happens. If you’re running full-auto, it happens more.

      Realistically, unless you’re running FA a lot, or renting the gun out, it’s not a huge problem to replace the spring regularly. New springs go for less than $10 each, so it’s not too awful of a cost.

      If you’re competing, or making money with the gun, well then… what’s $300 for less downtime?

  • PK

    Pete, if you haven’t already, buy the barrel port brush for your MP5SD! The cleaning schedule is insane, but important. Not only do the ports get fouled fairly quickly (300 rounds is the usual between cleanings) but the action and of course chamber need attention as well.

  • Christian Hedegaard-Schou

    If I had a registered MG MP5, I think this would be a very worthwhile investment.

    Otherwise, I could buy a LOT of replacement springs for $350.

  • Raptor Fred

    “MAD type bolt head to handle +p and +P+ ammo” Now that is interesting to me.

  • SMH

    This is a very nice looking piece if it works. The biggest problem is the fact that the springs are so cheap. You can keep a spare or 3 for 4 for almost nothing. As the owner of a MP5 clone it might be a weak point but it is not problem that i run into often, and i just keep a spare around.

  • USMC03Vet

    Just further confirmation that Hk owners are filthy rich.

  • Sense Offender

    Man I wish my MAD 33AR came with one of those….

  • Jirka Kýhos

    same extractor like on psg 1 or msg 90