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The Williams Foolproof FP-GR-TK is a receiver-mounted peep sight built for rifles and air guns with grooved, dovetailed receivers. It swaps out a basic open sight for a true aperture setup, which naturally sharpens your focus on the front post and target. Williams has been making this style of sight since 1926, and the Foolproof line has earned its reputation by keeping things simple and keeping its zero where you set it.
The heart of this sight is the internal micrometer adjustment. Instead of loosening screws and eyeballing it, you dial windage and elevation with blued steel target knobs that move click at a time. Those adjustments lock positively, so recoil and handling won't walk your setting out of place. White tick marks on the body make it easy to track and repeat your adjustments, which is handy if you ever need to dial back to a known zero.
This model is designed for grooved receivers, the kind found on plenty of .22 rifles and air guns with dovetail grooves. The sight body runs about 1-5/8 inches with a width around 25/32 of an inch, and it tips the scale at just an ounce and a half, so it won't throw off the balance of a light rimfire. The frame is rust-free aluminum finished in a durable blue-black anodized coat, while the knobs and aperture are blued steel. The included aperture has a 3/8-inch outside diameter and a .093-inch peep opening, and it's knurled so you can thread it in or out by hand.
The low line of sight design keeps your view clean, with no bulky housing blotting out the target. For anyone running a classic rimfire or an air rifle and wanting a cleaner, more repeatable sight picture than factory open sights offer, the Foolproof FP-GR-TK is a proven, no-nonsense upgrade.
This model is built for rifles and air guns with grooved, dovetailed receivers, which covers a lot of .22 rimfires and air rifles. It uses the dovetail grooves on top of the receiver to mount, giving guns that came with basic open sights the advantage of a peep. Check that your receiver has grooves in the right width range before ordering.
The grooved receiver version mounts to the existing dovetail grooves on top of the receiver, so most guns with factory grooves won't need any drilling. Some receivers may still require drilling and tapping depending on the setup, so it's worth confirming your rifle's receiver configuration first. If your rifle isn't grooved, Williams makes other Foolproof models for screw-hole mounting.
The internal micrometer adjustments lock positively, which keeps the sight from drifting out of place under recoil or normal handling. You adjust windage and elevation with the blued steel target knobs one click at a time, and white tick marks on the body let you track and return to a known setting. That repeatability is a big reason the Foolproof line has stuck around for decades.
The included aperture has a .093-inch (2.4mm) peep opening and a 3/8-inch outside diameter. It's knurled so you can install or remove it by hand without tools. That opening offers a clean, repeatable sight picture well suited to target work and plinking with rimfires and air rifles.
| UPC | 053506096855 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 009685 |
| Color | Black |
| Style | Adjustable |
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