The Training bolt is an equal part of the equation in making this ammo function and cycle reliably. Lets take a look at it. The one I received was manufactured by Rheinmetall and is marked Üb . The Ümlaut stands for Übungsmunition or practice ammunition. I am tempted just to call it the Ümlaut bolt……. So be it.
The Ümlaut bolt is quite different from a standard G3 bolt and carrier. The most obvious difference is it’s mass and bolt head.
Üb Ümlaut Bolt and carrier; 586 g
Standard G3 Bolt and carrier; 754 g
Üb Umlaut Bolt face diameter; 11.61 mm ( .457 in)
Standard G3 Bolt face diameter; 12.7 mm ( .474 in)
It is a fairly skeletonized version of the std. carrier with small wings extending on the sides to guide it against the receiver rails.
This unit operates as a straight blowback affair using only the recoil spring of the buttstock to lock it closed. With no need for locking into the trunion there are no rollers or locking piece. The firing pin and spring are housed in the bolt and carrier but the design does not permit detail stripping in the normal fashion. In fact I was at a loss to see how difficult or easy further disassembly is going to be (no manual is included). It appears there may be a pin that, with removal, will allow the bolt head to come off the front. I have not attempted this yet.
For installation, no more is required than to sub the Ümlaut bolt and carrier for the standard and then reassemble. The manual of arms does not change. Charging is now effortless because you are no longer unlocking the bolt when using the charging handle. Whether or not a user could get this ammunition to cycle in a rifle by removing the rollers from a standard bolt/carrier remains to be seen. It does not sound like an ideal practice given the weight difference and that the bolt head would be flopping around on the locking piece during cycling.
Frequent HK shooters may share the slight feeling of trepidation in the back of my mind as I prepared to fire this with an unlocked breech. Of course the engineers have worked out all the calculations, I know. It’s just something that, up till now, would have been considered by me as an unnatural act for roller locking rifle.
Set up at the 50-yard line with the diopter at 200M. I put one round in a mag, charged it and squeezed. BLAM! Ch Chunk! The report was normal and the “Ch Chunk” was the feel of the carrier flopping back and forth. The impact was right where it should have been. There was some muzzle blast but no recoil whatsoever. Just the cycling of that Ümlaut bolt as if it were running on supply of compressed air. (I guess it is in a way). There was positive ejection to 2 o’clock. Only 10 or 12 feet, as opposed to the normal 25’. I put three more blue cartridges in a 5 round CETME mag and had a FTFeed on the third round. The CETME 5 rounder was little loose in the well and the bolt smashed a training round. There were no failures of any kind using G3 mags loaded with 10 rounds for the rest of 100 rounds. The dwell time on the bolt was not slow enough to prevent rapid or firing with a quick cadence.
There were several other shooters at the Racine range that day including a Presidents 100 winner. They all tried all least 10 rounds and were giggling like kids after they fired it. It was a pretty windy day and the ambient temp was close to freezing. I was not expecting much down range but was pleasantly surprised how flat it shot at 100, especially on a day like that. The “tips” all broke through paper and cardboard to be found laying on the sand berm behind the target.
While not “match” practice ammo it was more than any of the shooters expected from plastic bullets. These 100 yard targets (8” shoot n see) were from the best shooters there. On a calm day I would expect this spread to settle down.
Soda cans would be great reactive target, as the little pill will waste all it’s energy busting them up.
Clean up was a breeze. The powder is very clean burning and 100 rounds of residue wiped right off with some Kroil and patches. Some may speculate about plastic residue in the bore or flutes. I can say I noticed no visible fouling or residue. The thermoplastic case would have to have excellent heat resistance for this application. Considering all the other engineering in this product it is no surprise that it stands up in this area as well. Some bore-foam and snake was all it took to make it mirror clean.
So the DAG Übungsmunition and the Üb training bolt were a hit with me. While this ammunition will likely be limited to single shot use in most 7.62 rifles, if you have a G3/HK91 or PTR 91 you may find the Bolt/Ammo combo to be an interesting addition to your kit and ammo pile. The current availability of the Ümlaut Bolt and carrier from Dan’s makes the whole proposition make sense.