NBS 4-40 Set Screw For Rear Takedown Detent Spring - 1/8" Long - SS - Qty. 1

Name: NBS 4-40 Set Screw For Rear Takedown Detent Spring - 1/8" Long - SS - Qty. 1
Brand: NBS

NBS · Lower Parts

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Best price

$1.09at AR15Discounts

Sale checked Oct 31, 2026

Buy at AR15Discounts

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Where to buy

Store	Price	Availability	Buy	Add to build
AR15Discounts Best price	$1.09Salechecked Oct 31, 2026	Check store	Buy at AR15Discounts
Dirty Bird	$1.39checked Oct 31, 2026	Check store	Buy at Dirty Bird

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

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Dashed line = out of stock. Tracking since Oct 28, 2026.

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Store	Latest	Lowest	Highest
AR15Discounts	$1.09	$1.09	$1.09
Dirty Bird	$1.39	$1.39	$1.39

Since Oct 28, 2026.

About this part

The NBS 4-40 Set Screw For Rear Takedown Detent Spring - 1/8" Long - SS - Qty. 1 is a lower part from NBS. It's sold by 2 stores, from $1.09 to $1.39.

Specifications

Manufacturer: NBS
Type: Spring
Material: Steel

From the manufacturer

For use with lower receivers that have a 4-40 threaded rear takedown detent spring hole. Purchase includes only one screw. Note: You may need to snip 1/8" off the detent spring to prevent excess pressure between the detent and the rear takedown pin. Material 18-8 Stainless Steel Thread Size 4-40 Length 1/8" Drive Size 0.050" Screw Size Decimal Equivalent 0.112" Hardness Rockwell B80 Specifications Met ASME B18.3 Thread Type UNC Thread Spacing Coarse Thread Fit Class 3A Thread Direction Right Hand Drive Style Hex Tip Type Flat