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Your cart is empty.Your marker can fire thousands of rounds every week, puts up with the beating of countless rainy Sundays, and withstands a number of slides through the dirt and mud. Through all of this, you still expect your marker to perform week in and week out. A small bit of maintenance is key to ensuring that your marker functions and performs at its best. One major aspect of marker maintenance is replacing your o-rings. The o-rings in your marker wear down over time by withstanding thousands of cycles along with coming in contact with dirt/debris. Our kits provide an easy and inexpensive way to keep your marker in top shape by swapping out your o-rings. The Field Medic kit by Captain O-Ring is an excellent kit to have on hand for fixing a variety of markers. The purpose of this kit is for replacing individual o-rings quickly if they fail. This kit includes 3 of each o-ring size, so it may not contain enough to rebuild your entire marker. If you are interested in replacing all of the o-rings in your marker at once, our individual marker kits are more suited for that need.
Jose Soto
2025-09-05 12:10:50
Quickly found the two o rings that I needed for my two leaking air rifles using the provided size finder. They seal well and fixed my leaks. ðŸ‘I’ve used this set about 4 times this month! A trip saver!
Tommy Cecere
2025-08-14 13:36:27
Took a few trys on finding the right kit but this one hit the mark. Thanks to customer service on helping out great people.
J. H. Landsberger
2025-07-09 09:38:32
I repair and rebuild Paintball guns, this kit comes in so handy. Every field should offer them for sale and every paintballer should have one in their bag.
E W
2025-06-29 11:52:02
A lot of the o ring I put on my bolt made it very difficult to put back in the gun and yes I greased it and it still caused air leaks and yes I double checked they were the right ones
vicente
2025-05-26 16:12:21
Good for feild maintenance would recommend.
Customer
2025-05-07 12:36:46
I recently purchased the Field Medic color O-ring kit and I'm very happy with the purchase. The quality of the O-rings and color coordinated O-rings chart were great. I plan on purchasing a bigger kit soon. This product exceeded my expectation, I Highly recommend this product.
lisa Gonzalez
2025-04-14 14:27:09
comes with a lot of different sizes
Philip Dunham
2025-02-07 17:37:21
I chose this product because it contains the majority of sizes needed for my older Tippmann A5 (according to size charts for that marker). The sizes match up, but the o-rings are too thin to properly seal. I switched back to the original o-rings to be able to use my marker, and I'm looking for a kit that is better suited to the Tippmann A5.
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