Timney Competition Trigger 668S - AR-15 Single-Stage 4 lb - Small Pin
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Drop-in fit for AR-15/M4 pattern lower receivers with small (.154 in) trigger pins. Confirm pin size before ordering.
Not sure it fits your rifle? Ask us before you order
The Timney Competition 668S is a single-stage drop-in trigger for AR-15 and M4 pattern rifles, fitting small-pin (.154 in) lower receivers.
The classic Timney Competition — a hand-calibrated 4 lb (1.8 kg) single-stage trigger that has anchored match ARs for decades.
The Timney Competition 668S drops a glass-crisp 4 lb (1.8 kg) single-stage pull into small-pin (.154 in) AR-15 lowers. Each unit is hand-calibrated: no creep, minimal overtravel and a break so repeatable it becomes part of your subconscious — exactly what deliberate match shooting demands. The 4 lb (1.8 kg) weight is the time-proven balance point: light enough for precision, deliberate enough for stages shot under adrenaline.
This is the trigger that introduced generations of AR-15 shooters to what a proper break feels like, in a self-contained drop-in module that installs in minutes and holds its calibration for the life of the rifle.
Drops into small-pin AR-15/M4 pattern lower receivers with .154 in trigger pins, using the existing pin holes — including UK straight-pull AR-15 builds, where the deliberate 4 lb (1.8 kg) break suits aimed, unhurried shooting. Large-pin receivers are not compatible, so confirm your pin size before ordering. Function-check the rifle fully before live fire.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Small-pin (.154 in) AR-15 / M4 lower receivers |
| Type | Single-stage trigger |
| Finish | Black |
| Pull weight | 4 lb (1.8 kg) |
| Made in | USA |
| Brand | Timney Triggers |
| MPN | 668S |
The classic competition break. Order the 668S today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Timney Triggers.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Small-pin (.154 in) AR-15 / M4 lower receivers |
| Type | Single-stage trigger |
| Finish | Black |
| Pull weight | 4 lb (1.8 kg) |
| Made in | USA |
| Brand | Timney Triggers |
| MPN | 668S |
| Category | Trigger |
| Shipping weight | 0.2 kg |
| Barcode | 081950668236 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
It is a drop-in trigger for AR-15/M4 pattern lower receivers built with small trigger pins, measuring .154 in. Large-pin receivers will not take it, so confirm your pin size before ordering rather than after. If you cannot tell from the receiver's paperwork, contact us with the make and model.
The 668S breaks in one clean stage at 4 lb (1.8 kg), which is lighter and crisper than a standard trigger group but still substantial enough for general use rather than being a hair trigger. Single-stage suits shooters who want the break to come at a predictable point without a take-up stage to manage. It is finished in black and made in the USA.
Compared with the two-stage AR PRO, which uses an 8 oz (225 g) first stage and 1.5 lb (680 g) second stage, the 668S is a heavier, simpler pull with no wall to hold against. Many shooters find 4 lb (1.8 kg) a sensible compromise for a rifle that gets used in more than one discipline. Our <a href="/blogs/buying-guides/ar-15-trigger-guide">AR-15 trigger guide</a> explains how those numbers translate to feel behind the rifle.
No, the unit uses the pins already in your receiver and needs no additional hardware. Since it is a small-pin part, the only shopping decision is confirming your lower matches. Fitting is ordinary trigger group replacement and should be followed by a careful function check.
The 668S is dispatched from the United Kingdom with £5 tracked UK delivery in 7–10 business days, and you'll get tracking by email when it ships. If the pin size or fit turns out to be wrong, see our returns policy or <a href="/pages/contact">contact us</a> and we'll help sort it.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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