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APS provides two muzzle tips with the ASR107 M4 URX Raptor. The two tips are exactly the same, except one of them is orange plastic while the other one is black metal. The photo below shows the two tips side-by-side.
The photo below shows the threaded side of the two muzzle tips.
By providing two tips, you don't have to paint the tip black yourself. And I find it really convenient to change to the black tip at the field, then change back to the orange tip for transporting and storage after the battle.
The shoulder stock is plastic on a metal buffer tube. It is rubber padded for your shoulder. It has six positions, which is pretty typical on a M4 carbine. The following photos shows the shoulder retracted and extended. When the should stock is retracted, the APS ASR107 M4 URX Raptor is an extremely short carbine. It is almost as short as the APS ASR106 Mini Patriot M4 as compared in the "Size Comparison: APS ASR107 M4 URX Raptor vs. APS ASR106 Patriot M4" thread.
But what is very rare is the small rail on the right side of the shoulder stock (shown in photo below). I can't imagine what you'd put on that rail, but it seems pretty cool.
There is a rather large screw on the rubber pad of the shoulder stock (see photo below). It is fastened to the sling mount on the other side. The middle of the screw head is slotted for a coin. But it is really tight out of the box, so you may have to use a big flat-headed screwdriver to loosen it. After removing the screw, you can pull off the rubber pad to reveal the battery compartment.
The battery compartment diameter is big enough for a stick battery, some wires, and a mini-Tamiya connector. It runs the full length of the buffer tube. When you extend the shoulder stock, you'll have a longer battery space.
A nunchuck or butterfly battery will work if you straighten it into a stick. I tried a 9.6v NiMH nunchuck battery and found that it just barely fits when the shoulder stock is fully extended; the rubber pad will have a slight bulge in that case. A 8.4v stick will fit perfectly. A 7.2v stick may allow you to shorten the shoulder stock extension by one position. The photos below shows the 9.6v battery in the battery compartment from the top and the side.
Originally, APS intended that you use a small LiPo stick battery in the compartment. If you do, you'll have plenty of space to move the shoulder stock back and forth. The following Evike photo compares the size of a LiPo stick battery to a 8.4v NiMH/NiCd stick battery.
From this picture, it's quite obvious the 11.1v LiPo battery is almost exactly half the length of a 9.6v NiMH/NiCd battery.
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