EMG Helios SLR Rifleworks Licensed B15 Airsoft AEG W/ ION M-LOK Handguard (Color: Black / 13.7" HDX Handguard / 350 FPS)

"Build quality is really good no wobble at all you are limited in battery space but not too bad, everything feels really good shoots far for a cqb gun would not recommend this for long ranges but medium to short , i got the 4.25" LITE HANDGUARD / 350 FPS) , overall only thing i am going To change on this is the motor its kind of slow

"so i picked up another one of these, this time the 13.7 model, it went on sale for $240 and I picked it up because I liked my 4.25" model so much, the only thing I forgot to note in my original review is the qaulity of the body and mating between the upper and lower receivers are perfect, there is no wobble between them, on either model.
I was very happy to see that the 13.7 model comes with a full cylinder, saves me the trouble of having to tear into the gear box just so I can maximize compression, that is guns with longer barrels, my 4.25 model is still stock.
the one thing that really stands out to me on the 13.7 model is how quite of a gun it is, there is not excessive noise from it at all, I dont hear the gear box at all and the motor sounds healthy, even the muzzle noise is virtually nothing.
its not a whiny motor but thats about it, it seems I got a lemon with my 4.25 model motor, the motor on my 13.7 is better, but its still very lackluster, it just does not have the rate of fire I look for, I cant speak to anything else on the motor, i will very likely swap mine in the future.
I have not been into the gear box of either gun, largely because I just dont need to, that being said this has a cut out in the side of the gear box very similar to the krytacs that let you see the sector gear and piston teeth engage, and while i cant see the other gears, it looks very dry inside the gear box, it does not sound dry, like it needs lube, but it looks a little dry for my taste. the sector gear looks like it only has a dry film lubricant on it, and thats likely the story with the other gears, that when they were manufactured the gears were treated with a dry film to prevent rust, and im under the impression thats it as far as lubrication goes, im probably wrong, but I have no desire to go through the trouble of opening the gear box just to see if it has lube, I run my guns stock until they break, then I upgrade them.
something that I really dont like on either model, or any model for that matter is the dust covers, they are polymer, which I really dont mind at all, its that has an american flag design on the outside and it feels really out of place on this rifle with the woderfully designed machined surfaces on the upper an lower. I honestly would not have cared if it was a normal dust cover, but i digress.
this came with a different stock than the 4.25 model and im not impressed, thankfully the stock does not wobble, but I dont understand why on a airsoft stock, that you wouldnt make the butt pad removable, the butt pad on the 4.25 is removable, but for some reason that seems to be an after thought on the 13.7, you have to take the entire stock off to access the battery compartment, look ill gladly suffer if I swap the stock myself for a magpul one or what ever stock i run if I think it will look good, but it just makes no sense to me, that airsoft gun, whose other models have a removable butt pad, that they skimped on this one. for this reason alone I swapped it for a 416a5 stock.
I cant really think of anyting else to note on these guns, I have personally used the 4.25 out doors several times and as a loaner gun, so it has seen quite a bit of use, and it is still going strong, I cant wait to use my 13.7 model. with that being said it almost saddens me I doubt i will purchase another one of the slr rifles, I already have both ends of the spectrum covered so I just dont see the need to get another one, even if they go on sale.
I am still rating this 4 stars because the motors and im still salty about the stock. but I truly love the slr rifles, my advice is as follows, wait for them to go on sale, which seems pretty often than pick it up, and swap the motor and rock it.

"so i was looking for a smaller rifle for outdoors for 2 main reasons, easier to maneuver in the brush with, and lighter weight, but still full metal. this went on sale and I picked up the 4.25" model in 2 tone gray. it is not a bad rifle by any stretch, but it severely lacks in some key areas, all are easily fixable. first on foremost was the color, I actually regretted purchasing the 2 tone gray color, the pictures are not very telling of how light the gray is, its almost a primer color, I painted mine black to match everything else, if you plan on picking one of these up, I would recommend sticking with black or dark earth. second major complaint is the motor is atrociously bad, easily the worst airsoft motor I have ever encountered, reminds me of the old G&G motors before G&G got good. absolutely pathetic ROF and sounded horrid. I was getting 14 RPS on a fully charged 11.1 30c lipo. super easy fix and swapped it on the spot for a better motor. accuracy and range was what I was expecting, not good, I almost felt the 4.25" model was to short, but with a vertical grip and emg guardian suppressor (short) handles amazing, i put in an extended inner barrel and new hop up, its usable now, but im not thrilled, will require more tuning to get the accuracy and range I want. internally its held up fine, sounds "strong" and "clean" after swapping the motor. my last biggest complaint is that the stock is super loose, loosiest stock I have ever felt on any gun period, its bad, it rattles, this was remedied with electrical tape. surprisingly I like the stock, I usually swap that out right away, stick with buffer tube lipos or tri cell lipos on this, the stock is shorter than normal and gives me the perfect length of pull maxed out ( i usually run m4s 2 or 3 clicks out).
I am so impressed with this rifle that I plan on picking up different lengths when they go on sale in the future, take my advice if this rifle catches your eye, wait for it to go on sale and pick one up, just be prepared to swap the aforementioned parts on the sport, but it is an amazing gun with tons of potential

"In fairness to Evike, and to those looking at this gun, I'd like to amend my original review. I hadn't fully torn the gun down at the time I wrote my review - it was based more on questions I had asked to techs at Evike, and it's possible that they just hadn't torn down this specific gun yet to know the exact answers. Totally understandable (they sell a lot of different guns!). But I would like to fill in some of the blanks that aren't listed about this gun:

This gun DOES have the following upgraded internals:
- Quick change spring system
- Full metal rack piston
- Aluminum cylinder head (bright blue colored/EMG?)
- Aluminum nozzle with single O-ring
- I believe some type of small, basic MOSFET, built on the trigger contacts

The quick change spring is not quite as convenient as others I've seen, since you do have to take the buffer tube off completely via the Phillips head screw attachment to the lower receiver, but this is WAY more convenient than having to take out the entire gearbox.

I have made the following upgrades to the gun, and it's actually in really good shape now, and shoots well:
- First and most importantly, the tappet plate. The tappet that this gun ships with has a very weird notch on the tail that contacts the sector gear. The sector gear starts pulling the tappet plate normally, then it reaches this notch, and the tappet plate and nozzle slip back forwards. Depending on where in the cycle the gun stopped, it was intermittently causing the nozzle to not be pulled back far enough, causing feeding issues. This could have been in some combination with a small amount of overspin (nozzle almost always ends up resting in the retracted position, in semi-auto), but I'm not sure. I replaced it with the Guarder tappet plate, and it's been shooting great and this issue went away.
- Upgraded the nozzle to Maxx Model 21.25mm, which is a hair shorter than the stock nozzle. I did this in combination with the tappet plate swap, hoping that it would further improve that issue I described above.
- Went with the Maxx Model nozzle because I had previously upgraded the hop-up to the Maxx Model ME-PRO. This hop-up fit fine in this gun, and worked mostly fine even with the stock nozzle, but better now with the Maxx Model nozzle. Really nice to have a hop-up that doesn't drop 4-5 BBs on every reload!
- Upgraded the bucking to a Maple Leaf Macaron 60°, paired with a Maple Leaf Omega nub. Very nice combo.
- Upgraded the barrel to a Lambda "FIVE" 208mm. This is 48mm longer than the stock brass barrel (I have the 5.5" handguard model of this gun), but has been working well, and is much more accurate than the stock barrel. The stock cylinder in this gun is ported for shorter barrels, but there is still some room to go a little longer than 160mm as far as I can tell (up to 250mm maybe?). I hide this excess inner barrel inside the mock suppressor on the gun.
- After all of these upgrades, I had maybe a 10-15 FPS jump in the gun, so I ended up putting an M95 spring in it to be safe, and stay under the requirements of a local indoor field. I'm currently shooting around 340 FPS with 0.25g BBs (field limit is 360 FPS with 0.20g BBs).

I still maintain that the externals on this gun look very nice - on par with my real steel AR honestly. I also like the EMG grip and stock. I'm going to bump my rating up to 4 stars, because of the externals, and because the internals were pretty easy to learn on and modify. Still not 5 stars though, as I think the price is a little steep considering the upgrades that this gun "needed" (tappet plate, barrel, bucking, nub, at the very least). But I suppose we're paying for the SLR licensing, which I'm mostly okay with given the really nice quality of the externals.

"Overall impressions
Pros:
- great design exterior
- lightweight

Cons:
- trigger pull is heavy and VERY long take up. I own over 25 replicas from G&g arp556 to genuine umbrella armory ocaw, HPA Polarstar, Wolverine mtw, and have several upgraded triggers along with oem triggers on krytac and Vfc, Novritsch. This is the absolute worst trigger ever made. You can fire one shot every 2 seconds on semi, if you are lucky, and I got a fast trigger finger.
-ROF is a lackluster 16-18 rps with a 11.1v Lipo 25-50c.

I bought this for the lightweight and design benefits with the knowledge that I’m upgrading the gearbox in it. It’s not a good gun IMO for performance if yo were to keep it stock. Looks great but poor performance compared to oem Vfc, G&g, and krytac guns.

"Not at all worth the money. After doing some research and now owning this Helios B15, I wish I would have bought a CYMA Platinum instead.

This gun has zero high quality/upgraded internals, no quick change spring. All you're paying for here is the externals, which I will say are very nice and feel like the same quality as my real steel AR. Also, it does shoot pretty well with 0.23s, after I shimmed the end of the internal barrel with painters tape (it was off-center, up against the upper right hand part of the external barrel when I got it. Caused it to constantly shoot high and right.)

Get a CYMA Platinum instead - better gear box, quick change spring, aluminum piston and piston head with full metal rack, etc., and for a lower price!