It is constructed to standard M16 length, with the adjustable butt pad enabling it to be longer by ¾ inch (at max extension) or shorter by ¼ inch ( at full retraction). This adds length to your rifle for better seating of the gun into your shoulder and “Length of pull“, or aids, along with the cheek piece, to better seat your eye with any optics, that may also have certain distances of eye relief.

Thicker butt pads can be purchased to add further length to the stock for larger users. The standard butt pad is ¼ inch thick durable rubber, held on by two steel hex bolts.

The cheek piece also extends to a maximum height of ¾ inch, and has a large enough surface area to seat most cheeks..

Both the cheek and butt pad are fully adjustable with adjuster wheels(accessible both sides) on a steel shaft, which give a very firm, distinct click for purposeful adjustment. They could not be operated accidentally, and they hold position through any application of pressure or pulling.

There are two steel raised sling bars (one vertically at the rear of stock, one horizontally along the stock tube), which are raised and are to be removed via two steel hex bolts if you cannot thread your sling through.

The bolts go right the way through the stock (the sling bar acting as the nut) and allow you to fit the sling bars either side of the stock and provide a rock solid fitment for your sling, up to 1 ¼ inch wide.

The two bolts on the horizontal bar also secure the stock tube cover, should you want to remove it or replace it with the spare. The spare tube cover I would imagine is if you chewed one up with your charging handle, though there is plenty of clearance for operation.

There is a small plastic spacer to attach to the inner face of the stock, under the stock tube where it meets the receiver.

This can be left off or fitted, according to your receiver and any side wobble you may have. If the spacer does not fit, yet you have wobble, simply seating the stock straight and tightening the stock tube bolt securely is efficient.

The stock also features in it’s moulding, a standard 20mm rail on the underside, which is covered by a removable plastic cover that slides along the rail. This has a small hole to pry it off with a screw driver, but it can be release by hand pressure, although this won’t fall off in the field.

In this example, the PRS was fitted to a Western Arms/G&P WOC.

• Removal of the original stock and tube via unscrewing the stock nut and stock tube.
• Remove recoil spring and spring guide from the stock tube.

These could be transferred, although Magpul supply a slightly different spring and also a tube inner spacer.

• Screw the new tube with spring, guide /spacer, into your receiver. There is no stock ring nut with this setup, so screw it tightly.
• Remove the bolt from the end of the tube and set aside while removing the butt pad from the stock to access the tube bolt.

At this point, test-fit the stock onto the tube.

There is a small plastic spacer included to attach to the inner face of the stock, under the stock tube where it meets the receiver.

This can be left off or fitted, according to your receiver and any twist wobble you may have. If the spacer does not fit, yet you have wobble, simply seating the stock central and tightening the stock tube bolt securely is efficient.

• When you’re happy with the seating of your stock (it is a fixed stock remember, so get it seated straight) you can then fit the stock tube bolt you removed earlier, through the hole in the butt plate.

• You can then replace the butt pad with the two bolts.

However I do feel the small stock spacer not curing the wobble in this example is a slight flaw, as the tube bolt being tight cannot permanently cure wobble,. While Magpul being considerate towards receiver discrepancies and including the part, this cannot be deemed a fault as there are so many different receiver specs and dimensions in Airsoft for the small spacer to contribute as a fix for every individual receiver.

To fit a sling (up to 1 ¼ inch wide) the sling bars are to be removed via two steel hex bolts if you cannot thread your sling through.

The bolts go right the way through the stock (the sling bar acting as the nut) and allow you to fit the sling bars either side of the stock and provide a rock solid fitment for your sling.

The rail is built for fitting an adjustable Monopod, also available from Magpul for adjusting stock elevation for even more precise target shooting with a static rifle. For a more basic option, a simple stubby or full length vertical grip to keep your rifle off the ground / for storage of torch batteries etc.