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MP7 FACEOFF: Galaxy G-7 vs Well R-4

Submitted by Brahma on Wed, 09/10/2008 - 07:00

The MP7 is a personal defense weapon (PDW) manufactured by Heckler & Koch (H&K) and chambered for the 4.6x30mm cartridge. It was designed in conjunction with the new cartridge to meet NATO requirements published in 1989 calling for a machine pistol or submachine gun with greater effect against body armor than current models which are limited due to use of standard handgun cartridges.

It is a direct competitor of the FN P90 also developed to meet the new NATO requirements. The weapon has been through four revisions and the current version is the MP7A1. It went into production in 2001. It is compact and light using polymers in its construction.

The proliferation of high-quality body armor has begun to make guns that fire pistol ammunition (such as HK's earlier MP5 or USP) ineffective. In response to this trend, HK designed the MP7 (along with the brand new UCP, which uses the same ammunition) to penetrate body armor, but small enough to be used in place of either a pistol or a submachine gun.

The weapon allows a conventional 20-round or 40-round box magazine to be fit within the pistol grip (the former being comparable in size to a 15-round 9 mm magazine, while the latter compares to a 30-round 9 mm magazine). The weapon features an ambidextrous fire-select lever and rearcocking grip. It has an extendable stock and a folding front grip. It can be fired either one-handed or two-handed. - from Wikipedia

New kids on the block

Technically categorized as an automatic electric pistol (AEP), these newcomers in the airsoft scene—the Galaxy G-7 and the Well R-4—has yet to gain some following. Without any aftermarket upgrade parts available—except maybe for the Tokyo Marui versions—these machine pistols are more likely to be relegated to collectors’ item status. Or, are they?

Thanks in part to Discovery Channel’s Future Weapons series, airsoft players became aware of how potent the MP7 is in real life. With low-fps CQC games slowly gaining popularity in most areas, especially in the Philippines, the MP7 is fast becoming a weapon of choice by some.

What you’re getting out-of-the-box

Both units come ready to play. Each package—Galaxy G-4 and Well R-4—consists of the main unit, a 7.2V mini-type NiMH battery with AC/DC adapter/charger, a BB loader, a cleaning rod, a 35-round standard magazine and a pack of 0.2g BBs. One advantage of the Galaxy G-7 is that it comes with a 200-round extended magazine.

Using a Madbull chrono, the G-7 clocked 255.6fps against the R-4’s measly 133.2fps. There are reports however, that the R-4 can go as much as 200fps out-of-the-box in the muzzle velocity department.

Battery and charger

Not too many of us pay much attention to the quality of battery and charger combo that were getting from our units. For this “shootfest”, we can’t help but notice that, although both batteries have 7.2V output voltage, the G-7’s have more juice at 650mAh, compared to the R-4’s 450mAh capacity.


Another distinct advantage of the G-7 is that it comes with a 200-round extended magazine—a big plus when fast-paced CQC games. However, quality-wise, the G-7 magazine looks flimsy and about ready to crack.

Looks and feel

Aesthetically, both guns are similar, except for the distinguishable “G-7 Made in China” markings on Galaxy’s version. Constructed mainly from ABS materials, both guns are lightweight and comes with no-slip grip, a retractable stock and folding front grip, suitable for operating with one or both hands. The top and side rails are metal, while the body is entirely plastic. The metal parts, aside from the rails, are the inner barrel (brass), receiver end cap and the muzzle (flash hider).

Each machine pistol comes with detachable metal flip-up front and rear sights. Both sights can be configured for close and long-range shooting.

For avid users of the MP5 series, operating this baby is a cinch. The trigger group or fire select mode is a three-position selector/safety: safe, semiautomatic and full-automatic. The selector lever is ambidextrous and its settings are marked with bullet pictograms.

The battery is accessed by pressing a tab on the muzzle assembly and pulling it out:

Be sure that the selector switch is on “SAFE” before re-inserting the battery, as the selector plate obstructs the battery when engaged. This is an excellent design to prevent any accidental firing.

Pulling the charging handle exposes the HOP assembly:

Due mainly to its miniaturized design, operating the HOP adjustment dial is a challenge, especially if you have big hands.


Disassembling the MP7s is a breeze. The retractable stock is removed by pressing the retracting lock all the way down, and pulling the stock out. The sights must be detached, prior to removing the top rail, which is secured by allen screws. The receiver cap/cover holding the stock assembly is held in place by two metal pins (much like the ones on the MP5s). Removing the cap/cover will give you access to the gearbox and motor assembly.

The gearbox

The first thing you’d notice when you compare both gearbox assemblies are the bushings—the G-7 have brass bushings, while the R-4 comes with plastic ones, which incidentally seem s to be the standard in most AEGs.

For the purpose of showing you what makes this airsoft replica works, we’ve taken apart the R-4’s metal gearbox, which is held together by four Philips screws. Like in most AEGs, the MP7s internal components include: spring and spring guide, a four-piece gear set (much like the ones found on AEPs), a closed-type cylinder and cylinder head, piston body with ported piston head. The motor is integrated in the gearbox assembly. The gear set is made of hard metal.

Note: Reassembling the gear set is quite tricky, as the sector gear MUST be aligned with the cutoff lever.


Owing to the G-7’s 650mAh battery—fully-charged for 4 hours—it managed to empty almost six 200-round extended magazines or almost 1,200 rounds, against the R-4’s almost fourteen 35-round standard magazine or about 500 rounds.

The G-7 has an excellent range at more than 10m, while the R-4’s low muzzle velocity robs it of a more potent “kill range”. A great secondary weapon, both MP7s are better alternative to GBBs or even AEPs, especially in CQC.

Handling and balance is good, albeit the R-4 is a tad heavier. This gun is not recommended for people with extra big hands though, since the magazine release is located in the trigger guard and can be accidentally pressed.

Although both guns are excellent alternative to GBBs in terms of practicality, Galaxy’s G-7 is more superior than Well’s R-4, in terms of muzzle velocity and range, not to mention that you get an extra hi-cap mag and 650mAh battery capacity.

For this “shootfest”, the G-7 gets our nod, but don't throw away that R-4 yet… it’s still gonna be great in complementing your PMC impression.

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