[Set] R603 - Negro [ARMY ARMAMENT] + Hi-Capa R501/R603/R604 Long Magazine - Black [JAG Arms]

Good pistol, the quality of the materials, its design and above all, its operation, make it one of the best I have tried. It is perfect for those who do not want to spend a lot for something of quality.
Buena pistola, la calidad de los materiales, su diseño y sobretodo, su funcionamiento, la hacen una de las mejores que e probado. Es perfecto para aquellos que no quieren gastar mucho por algo de calidad.

The one thing that everybody needs one in Airsoft. After some time one is not enough. And after some time two is not enough!! This one in particular is great cause it can hold many BBs!! Fast package and well delivered!

This looks so slick in the Pit Viper. Working flawlessly so far. It has of course higher capacity which is always good and just has a great tactical feel to it. It's a must to make sure you don't run out of ammo in the battlefield.

⭐⭐⭐⭐⭐ Hi-Capa R501/R603/R604 Long Magazine – Black [JAG Arms]

This long double-stack magazine converts a Hi-Capa into a persistent field tool. Construction feels sturdy. The increased tank capacity allows two or more full strings of fire per fill depending on gas and BB weight. The feed lips and spring provide reliable indexing with no hesitation. With the magazine installed the pistol sits a bit heavier and that extra mass actually improves recoil control and target follow-up when shooting fast strings.

Field performance: in both speedsoft and IPSC drills the longer mag reduced reload frequency dramatically. In real games I often only needed to reload once or twice per engagement period. Gas efficiency is excellent when paired with quality green gas and the mag’s valve holds pressure even in cooler conditions. Loading BBs takes slightly longer because the loader window is smaller, but that’s a minor tradeoff for the sustained shooting time it gives you.

Practical tips: carry a dedicated extended mag pouch or a modified pistol-mag pouch because standard pouches can be tight. Keep the fill valve lightly lubricated with silicone oil and avoid overfilling. If you move between platforms, double-check compatibility with non-JAG Hi-Capa variants; most users report cross-brand fit but always test before a match. Overall verdict: the long mag is a high-impact upgrade for anyone who wants capacity, gas economy, and steadier handling without sacrificing feed reliability.

Hi-Capa R501/R603/R604 Long Magazine – Black [JAG Arms]
Summary: Reliable, gas-efficient long mag that adds both capacity and stability – perfect for competitive use.

Review:
I purchased this long magazine for my Hi-Capa and it has been a fantastic upgrade. The build quality feels solid, with a strong feed spring and no wobble once inserted into the pistol. Gas efficiency is excellent: a full fill easily powers two full loads of BBs without leaks, even in colder weather. What I especially appreciate is that the extended size not only increases capacity but also gives the pistol a steadier grip for competitive shooting.
For anyone considering it: make sure to use high-quality green gas and keep the valve lightly lubricated, as this keeps performance consistent. If you want both reliability and extra firepower in a single package, this magazine is worth every cent.

Best magazines for hi-capa pistols! This will allow you to run around not worrying about having enough ammo to last the round. Works in all Hi-capa brands, no problems or concerns between brands. I also like the way this matches my black 2011s!

Fantastic magazine, holds lots of rounds and gas
Its not even that uncomfortable and looks great on the pistol.
If u use the pistol as a primary this is the way to go.
Might be too big for some pouches

Increased magazine for Jag arms pistols. I got it for my combat master and my sand Viper and it fits like a glove. The magazine has an increased tank of green gas and BBs and is great for extending the shooting session. The only flaw is that the loading window of the BBs is small and it takes a little longer to load the BBs but nothing impossible. Recommended

I have never used a green gas canister and I can tell you that it is really simple to use. This 1000 ml bottle is fantastic value for money and, despite almost 1000 shots fired, there is still gas inside. In addition, inside there is a small amount of silicone oil that will lubricate your replica. Recommended

Amazing magazine which is not much heavier than the standard sized one, the capacity is good enough to where in games where I am primarily using my pistol I only have to reload this big mag maybe once or twice per hour but this also depends on how much ammo you are looking to use.

I was afraid it would be clunky to carry around or have in the pistol but it actually is not any different than the small ones, you just have to get an extended pistol magazine pouch.

The Army Armament R603 is a standout choice in its category, with premium build quality and performance right out of the box—no modifications needed. Compared to similar replicas, it’s perfect for players seeking reliability without the hassle of adjustments.

One heads-up: although CO2 magazines were available when I purchased it, I discovered the R603 doesn’t actually work with CO2 despite being able to buy ‘compatible’ mags for it. I even checked with support, but unfortunately, CO2 isn’t an option. So, I’d recommend sticking to gas mags for reliable use. Aside from that, the only minor quirk is a slightly loose right-side safety, while the left-side works perfectly. Overall, it’s a high-quality, dependable pistol that’s ready for action straight from the box.

This Replica is absolute value for money it is complete made of metal feels really sturdy, it shoots very good (by temps above 15 degrees Celsius but this is normal for green gas)
The build quality is above expectation, the only minor is Thera are no logo's or engravings.

A great value for money pistol. The build quality is absolutely excellent. Its a very lightweight pistol with an amazing grip that makes it stick to your hand and never leave you alone when on the battlefield. A trustworthy friend when it comes to combat

I will start off straight to the point.

Pistol is amazing, functionality, durability, size, and performance

When I go and compete at airsoft events this pistols gets the job done and is so fast, as the slide is light and doesn't use much gas for the slide to move fast which is good!

And as you should know this is a great replica of the staccato so if you shoot real steel and conceal carry this is perfect to train with and the best part is through this website it gives you a really good holster for cheap if you buy this pistol as a bundle

All in all perfect pistol to compete/play airsoft and train real steel.