P99FS Barrel Guide & Barrel Spacer & Hop Spacer

MARUZEN
Custom parts to stabilize the trajectory and hop-up of the Walther P99FS

3D Printed
Material: PETG

1x Barrel Guide
1x Barrel Spacer
2x Hop-up Spacers (includes 1 spare)

Designed for strength and smooth movement when the barrel passes through, with no protrusions.

The hop-up spacers are a single flat plate with a stepped design, shaped to match the genuine bucking.
Unlike standard gas , this model has a unique window and bucking configuration.
Using a silicone rubber as a spacer for the unmodified bucking offers little advantage, so we've opted for a single-plate design focused on stability.
As these are thin plates, one spare is included, and they are made in a noticeable blue color to prevent breakage or loss.
(For rapid firing or similar usage, silicone might be preferable.)

The barrel guide and barrel spacer alone can improve grouping, so please consider the hop-up spacers as a bonus.

The example photos show the installation with an aftermarket inner barrel, but we have confirmed that it works fine with the genuine barrel as well.

For some CO2 magazines with low initial velocity, it may be better not to use the hop-up spacers.

The P99FS is also known for significant variations between individual units.
While these parts worked without issue on the unit we used for testing, please understand that they may not be compatible with the unit you own.
Furthermore, due to its unique construction, this gas will not achieve the same level of accuracy and stability as standard gas .

These were created through trial and error for personal use until we were satisfied with the results.
We are listing the extra units that were made.
We will produce more if there is demand, but these listings are generally for existing stock only.

As these are 3D printed, please understand that layer lines, minor inaccuracies, and rough areas may be present.

While installation is relatively simple, please proceed with the utmost care and at your own risk.

MARUZEN
Walther
P99
Walther
Fixed Slide
Fixed Slide