Walther LG400 - Power Mod from 7.5 to 16J

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credit: https://airgunaccuracy.wordpress.com/in ... her-lg400/

Prior Installing, you require:
1. Walther LG300 Reg. 16J
2. Adapter (contact Sven)

"I made another adapter for Frédérik to mount the Walther 16 Joule LG300 regulator to the Walther LG400 to convert it from 7.5 to 16 Joule. To show how to install the reg and adapter I made the pictures below."

WARNING: WHEN YOU USE ANY INFORMATION FROM ANY PAGE ON THIS WEBSITE YOU DO THIS AT YOUR OWN RESPONSIBILITY.

"The LG300 16Joule (or LG300 Dominator) regulators are factory set at about 75 to 78 bar output pressure. Some of these regulators are marked with 83, 84 or 85 with a pencil or marker. But I have checked four of these regs on two and three different manometers. And all of them had an output pressure of 75 to 78 bar.
The maximum velocity you will get at this pressure is 232 to 236 m/s (761 to 774 fps) or 14,5 to 15,0 Joule (10,7 to 11 FPE) with 8,4 grain JSB Exact. My rifle shot very accurate with this setup. If you think you need to get closer to 16 Joule / 12 foot-pound the reg output pressure needs to be set higher. The best way to do this is with a reg tester. If you do not have a reg tester you may try to increase the reg pressure by adjusting the regulator and testing the velocity. Be carefull when opening the reg and make very small steps on the set screw. It only needs 1/16th to 1/8th of a turn to increase the pressure to 85 bar. At 85 bar I got to a maximum velocity of 240 m/s (787 fps).

For opening and adjusting the Walther regulators see this page: https://airgunaccuracy.wordpress.com/wa ... egulators/

Preventing Point Of Impact Shift / POI shift: What you also need to do is to remove the o-ring / plastic ring under the barrel holder and adjust the barrel holder so the barrel is fully free floating. It takes some fiddling to get it right. The method I use now is to wrap a strip of printer paper in a double layer around the barrel. Loosen the both bolts on the barrel holder. Slide the paper over the barrel until under the barrel holder and tighten the bolts again. Then remove the paper and check by eye if the barrel holder does not touch the barrel."