Hey guys. I have a marauder pistol. Wanted to replace the guage on it. Where can I find a affordable and accurate guage for it. What size guage are on the marauder pistol. I see there are 23mm and 25mm. Idk what the size is for the marauder guns. Am looking for price around $10 to $15. Don't want to over spend on a guage. Thanks.