'Madbull' ACE M4 Stock Tube with Quick Detach Base (MB-ACEM4-7EXT-TUBE-QD).

These Madbull tactical stock tubes are compatible with standard AR (M16/M4) family weapons, replacing the standard stock tube with this enhanced version. These stock tubes have 7 position notches and come with tube bases with QD anchors for use with QD sling swivels. These tubes have screw-on end caps so you can use them with cap on for gas WA/G&P WOC system blowback M4s or with AEGs with cap off to gain access to a rear wired stock tube battery if you wish.

The ACE and PWS are both almost the same, the ACE has position number markings along the top while the PWS has position number markings along the left side. They also have slightly different bases, you can see the differences in the photos on this page. This model comes with stock tube, stock tube end cap, end cap o-ring, receiver attachment plate, base with QD anchors and necessary screws for installment. This model does not come with a QD sling swivel.

For details of the product, please visit madbull official web site:

http://www.madbullairsoft.com