TKO Airguns

Return to Home Page


Please be sure to read our Shipping Policies before ordering!
If paying by check or Money Order, See Ordering Instructions at the bottom of this page.

Quick Links: 
Section 1
Section 2
Marader Pistol
Section 3
Fill Caps
Section 4
1" Moderaors
Section 5
.875 Moderators
Section 6
.875 Moderators
Section 7
Custom Items
Section 8
Crosman - 1911

Includes the O-ring.

View a great YouTube video review of the Benjamin Discovery Air Rifle by Ted's Holdover.

Section 3:

Machined Fill Cap for the Discovery Rifle, and Marauder Pistol, Woodswalker and 1720T.

$13.00 when purchased with a TKO Moderator
(Shipped to USA & PR and Internationally)

 $16.00 When purchased seperately (Shipped only to USA)

(Sorry, this item isn't available for International Shipping unless a TKO LDC is also purchased)

Airgun Model

Click the "Add to Cart" button once if ordering only one TKO Mod.
Be sure to read our Shipping Policies before ordering!

The Discovery rifle and the Marauder based pistols use a TKO Moderator that slighly inteferes with the fill cap attachment.

These fill caps will fit your rifles and pistols perfectly, and also match the CF finish of our TKO Moderators.

The machined caps can also be used on your custom Discovery based or Crosman 22XX project.

NOTE: The Benjamin Maximus rifle, although is based on the Discovery Rifle, does not require a machined fill cap when installing a TKO Mod.

Remember ... you can send us your original fill cap for free machining and return shipping. Send to the address at the bottom of this page...

If ordering by mail, make checks or money orders
payable to and mail to:
Mike Tiehen (TKO)
323 S. 50th St
Omaha, NE 68132

Include a note with your email address with your order and we will provide a USPS Tracking number upon shipment.
Please be sure to read our
Shipping Policies before ordering.


TKO Airguns - 323 South 50th St. - Omaha, NE 68132 USA - 402-889-9222
1 pm - 5 pm Mon --- 8 am - 5 pm Tue-Fri --- 8 am-12 noon Most Saturdays --- Closed Sundays
Copyright 2022 - VEi/TKO Design