Roller delayed blowback pistol caliber carbines are extremely popular. Everyone wants an MP5 clone. But there are not many MP5-SD clones. HKBryce came out with a 3D printed SD handguard adapter that allows you to use an MP5-SD rubber handguard on a full size MP5.

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HKBryce BL-SD Handguard Adapter

HKBryce’s BL-SD (Boot Leg SD) adapter is a replacement for your MP5 handguard. It is 3D printed in carbon fiber nylon.  So it can hold up to 194º. He torture tested with 150 rds and a binary trigger. It should hold up to a typical range session.

The adapter has a rear hook to grab the trunnion of your roller-delayed clone.

Be careful with the two ears. There is a section cut out to make clearance for the takedown pin.

Installation is straightforward and easy. Just hook the rear section onto the trunnion and snap it up into position. Then pop the takedown pin back through.

The cutout also makes room for the sling loop. The rubber handguard will cover up the sling loop so you will not be able to use it.

Then you snap the rubber handguard onto the HKBryce BL-SD adapter. Now you can attach a trilug suppressor of your choosing for your MP5-SD at home. This is my H&K SP5 with the BL-SD adapter.

Other MP5 Clones?

Remember my review of the H&K SP5L? I converted it into an SP5-SD by using a Midwest Industries handguard and slipped the SD handguard over it. But nothing is holding the rubber handguard on other than the friction and clamping force of the spring steel. Here it is with the HKBryce BL-SD handguard adapter.

The sling loop sticks out a little bit which pushes the rubber handguard a bit.

What About The .22LR MP5?

I have an H&K .22LR MP5 pistol. I know they make a 16″ barreled rifle version that looks like an MP5SD. I decided to try the BL-SD adapter on my pistol. My trilug has been modified and replaced with a real trilug so it fits my 9mm can.

 

The sling look sticks out even more than my H&K SP5s. So the rubber handguard really sticks out.

You can remove the sling loop but it is permanent. Someone said it might be threaded. I can confirm it is not. But now I don’t have to worry about the sling loop getting in the way.

Where To Get Rubber Handguards?

HKBryce mentions this on his website. There are three options.

1. Original H&K German handguard
2. USA made handguard
3. Broad River Tactical

If you recall, Broad River Tactical makes the AR9-SD barrels. Which are ported AR9 barrels designed to work with SD-compatible suppressors. His hand guards are designed to fit the HK SD rubber shrouds.

The HKBryce BL-SD adapter retails for $77. This does not include the rubber handguard. Broad River Tactical is the cheapest with blem units for only $80. Brand new clean ones are $120. The USA and German versions on HKParts are more expensive. I have only used these on my H&K clones. How it fits other clones, I am not sure. You can reach out to HKBryce and see if he knows.

Thanks to HKBryce for sending this in for review. For more information, check out HKBryce’s website.