Review Request: KJ Works/TK GBBR M4

[brixx]

yes I just install the velocity reducer at my kjw m4 and its the same kick recoil everything using propane you can look at youtube type brixx38 I made some shots and show my old bolt carrier. Intallation of the velocity reducer is at Cradleairsoft.com also in youtube, by the way the delivery from KJW in Taiwan is also pretty fast too with Clare, parts that you need for your gun kjw m4. and no more using of the duster gas 134a hehe and easy change of FPS in your gun 5mins. hope it helps some GBBR users.

[KoolAidMan]

Originally Posted by brixx

yes I just install the velocity reducer at my kjw m4 and its the same kick recoil everything using propane you can look at youtube type brixx38 I made some shots and show my old bolt carrier. Intallation of the velocity reducer is at Cradleairsoft.com also in youtube, by the way the delivery from KJW in Taiwan is also pretty fast too with Clare, parts that you need for your gun kjw m4. and no more using of the duster gas 134a hehe and easy change of FPS in your gun 5mins. hope it helps some GBBR users.

how adjustable is it?

[Rookie Ab]

These are the results from the guy who manufactures the parts ;The tread can be found here on Arnies

http://www.arniesairsoft.co.uk/forum...owtopic=171349


Spacing AVG FPS
0.000 385
0.045 360
0.060 340
0.090 325
0.105 310
0.120 285

These were my results at 75 deg. F on propane from initial testing of the product.

[Hux37]

As someone who is not a real fan of the AR platform rifles, and getting to use one at work all the time, this review is going to be as harsh as I can possibly make it. First off, I won the gun in a raffle that was held by Herald from Edmonton Airsoft Regiment, which was held at the same time as his IPSC shoot. By the way, that was an amazing event, and I hope there is another one in December. Good job Herald.

Ok, now on the gun. It comes in a rather standard cardboard box with a black image of the KJW M4 on the front. The left has: KJ Works M4 Carbine Designed by Tanio Koba. With “Gas Blow Back” in the top right corner of the box. Inside, there is the wonderful standard form cut Styrofoam that holds everything. In the box you get the gun itself, two, yes I said TWO, magazines, small box of BBs, loading tool, and standard literature.

Ok, enough boring standard stuff. Let’s look at this wonderful new toy. Upon picking up the gun, the metal upper receiver adds a decent heft. Though, the feeling of the lower receiver seems to make it all for not. The clear plastic has a bit of a weak feel to it. But, I have not gamed this particular gun as it is a wee bit cold outside and gas guns obvious don’t work that well in the cold. On that note, I’ve noticed that rapid semi automatic fire of a full magazine causes the magazines to get rather cold. Yet, from what I could see, the rifle did not suffer any major cool down effects.

The front stock of the rifle is made of standard ABS plastic. They are a little shiny and weak feeling, but are good for what they do. This rifle is supposedly completely interchangeable with TM parts. The only TM parts I have for it are the Knight’s Pro Silencer and my old RIS off my SR16. Unfortunately, this RIS will not bolt onto the existing barrel as it is missing the flanges at the base near the receiver. The barrel contains 14mm CCW threads, making threading suppressors on to it very simple. The only problem was, unlike every other airsoft gun with threaded barrels, the flash hider is strictly held on by the grub screw. Under the flash suppressor, there is a brass thread protector. So I warn you to watch, and keep that grub screw tight. Or you are going to lose your wonderful flash suppressor that makes your AR so pretty. So I put my old one I had laying around onto it. Problem solved, AR still looks ARish.

The carry handle, front sight, upper receiver, outer barrel, and buffer tube are all metal. As I said above, the new Canadian legal smoked plastic lower receiver is a little fragile feeling. As I do not know if it will be at all possible to get the metal lower receiver that the rest of the world is allowed, I will not tempt fate and treat it as if it were a real rifle. Though, I must digress, the plastic isn’t clear and doesn’t look as absolutely horrid as some people think.

The body pins are not locked into the gun like the ones that came with my metal body I got from Huang last year. But, they are very difficult to even push through to allow you to open the receiver. So, the fear of them sliding out prematurely is easily taken care of. As I do not have a spare set of locking take down pins, I can’t say for certain that they will fit.

The body itself is very easy to split apart. Much like its real steel counterpart it is based on. Just apply a ton of force to the real take down pin, pull it out, and split the upper receiver from the lower. To pull out the bolt, pull back the cocking handle and the whole bolt assembly follows. I am not sure why there is a large rod in place of the gas key, but it’s there.

The gun itself is as close to real as you are going to get. You can run standard function tests on it, stoppage drills, everything. The working forward assist does come in useful. If you ride the cocking handle forward, the bolt will not always fully engage causing a “bolt partially forward” stoppage. Do your tap, rack, forward assist, bang drill and you’re set. Though, after firing four full magazines back to back, through this gun, I failed to receive a failure.

I’ve been running this gun on propane filled using the AI Propane adapter, and two drops of 10 weight silicone oil. Other than the minor cooling of the magazines on fast repeat firing, I have yet to have anything crack (yes, I am well away 128 rounds is still way too low to have a mass failure). The bolt lock always engages, the trigger is standard two stage military, and the recoil is very crisp. To top it all off, the gun is loud. I have shot it with a suppressor, but have not noticed any difference on the shooting end. I will hopefully find that out in late May or June when I get to really test this beast in a game.

The magazines are full metal and very durable feeling. I don’t intend to drop them onto cement or concrete to test this out, as I have a bad track record with magazines hitting such surfaces. The magazines come with a blank fire lock out. This is basically a little tab you pull down and lock into a detent at the bottom of its groove. This allows you to shoot the rifle with the magazine in, and not have to worry about holding the bolt release or re-cocking the rifle after every shot. It’s a good idea, but in my opinion, a little worrisome with the plastic bolt. The magazines also have a total capacity of 32 rounds. Meaning you now have to start thinking like a real soldier and counting your shots. No spray and pray crap here ladies and gents. An upside to these magazines, is that like all GBBs I have played with previously, they reliably feed all 32 BBs into the gun, and push the bolt release/stop every time. The magazines are based on the old Canadian THERMOLD magazines. Due to which, they are thicker and may not fit some smaller magazine pouches. I have tested them in my Guarder double magazine pouches, as well as in my real HSGI Wasatch vest. Both sets of pouches will hold two magazines snuggly. The other and probably most important thing about these magazines is that they have metal feed lips. And in the complete off chance that you manage to break them, they can be removed and replaced.

The last part I will look at is the hop up. It’s a new design, and completely different from the TM ones. The hop up wheel is still in the ejection port. It’s just above the bolt. It is hard to move, and refuses to back off after firing. So far, with the little I’ve fired, I have not had any problem with it. The accuracy is spot on at 25 feet. Or, as spot on as shooting a smooth sphere down a smooth brass barrel can be. I do plan on putting a M4 length 6.03mm tight bore barrel in as soon as the season comes around again. Until then, I will stick to the M733 inner barrel that is currently installed. Or so I have read in other reviews. I haven’t had a chance to take off the portion of the barrel in front of the flash hider yet.

That about sums up everything I can think of for this new GBBR by KJ Works/Tanio Koba. As I haven’t had a real chance to field it outside of the shooting range in my garage, I cannot say how well it holds up in the field. Though, I am sure someone on Arnies has posted, as they have much nicer weather in other parts of the world. I have yet to chronograph this GBBR, but from preliminary testing in my afore mentioned garage, at around 25 feet, every BB that hit the BB trap (using a Savage Arms steel pellet trap and BB Bastard .20g) they shattered. This leads me to think I should turn my hop up on, and maybe some .25g BBs for games. If you have any questions, please feel free to pm and ask.

CONS

- Plastic lower receiver feels a little fragile
- Elastic return buffer around cocking handle and bolt
¬- Bolt is plastic. Longevity in question
- Flash suppressor not threaded onto barrel. Sits on top of brass thread protector and is held on by small grub screw.
- Magazines are bulky and only hold 32 rounds
- Unable to change base plate of magazines if you want to put on Ranger Pulls
- Front Stocks is standard ABS. Feel weak


PROS

- Upper is heavy and metal
- Carry handle is all metal, and screws were tightened to beyond hand loosening
- Trigger Mechanism is close to the real steel
- 5 position collapsible stock has minimal wobble.
- Metal outer barrel
- Bolt Carrier is metal
- Working forward assist
- Working bolt lock
- Easy to use hop up adjustment
- Robust Magazines. Feel like they can take a lickin' and keep on tickin'. All metal
- Magazines are real capacity
- Magazines feed all 32 rounds flawlessly
- Suppressor ready with 14mm CCW
- Stock was immediately interchangeable to have VLTOR and MOE stocks fit with minimal wobble
- 5 Position LE style stock comes with gun
- Gun comes with 2 magazines, barrel tool, front sight tool, new speed loader for magazines.

Pictures here:

http://s955.photobucket.com/albums/ae31/Hux37/

[m102404]

That's a great write up, thank you.

Hope the IPSC stuff is going well. CAPS is coming up to our 3rd Year End Tourney and everyone's getting excited.

Please keep the range/performance reports on this one coming in. I'd really like to hear more about how it stands up.

Tys

[Rookie Ab]

Yes that was a great write up.Just want to mention though,the plastic bolt.You shouldn't worry to much about it,Raven1 on Arnies;

http://www.arniesairsoft.co.uk/forum...owtopic=171349

has somewhere around 10,000 bb's downrange with that bolt. The mags I have will hold 38 bb's but the loading tube only holds 32 so you have to add the 6 if you want them topped up.

Here's the one I'm playing around with.

[brixx]

what can I say this is a good AR out of the box.[IMG][/IMG]

[brixx]

sorry guys not a complete picture

[technik]

I have the Cansoft version for awhile now and although I'm not an Airsoft veteran, I am extremely happy with my purchase.

I have only shot about 1000+ rounds or so, but I have never experienced any problems whatsoever. On full Auto or quick bursts with Semi, the magazine does cool down considerably fast. However, it does not seem to affect the way the gun shoots. I have tried using Duster and Propane and the recoil has always been strong, and there hasn't been any problems with having the bolt lock back.

In all, I love the way GBBR's add to the realism, and the KJW M4 has been very impressive. I would highly recommend this gun.

P.S. Does anyone know which Metal Lower Receivers are compatible with this GBBR?

[brixx]

some of the guys buying the inokatsu are selling theres already, first of all two expensive you can buy two kjw m4 tanio koba and it will last you a long long time maan. Compare with the quality and effectiveness kjw m4 its almost the same.

[HeadlessChicken]

Out of curiosity, how proprietary are the stocks? Would I be able to fit a WA build stock onto the KJW?

[MoreToasties]

Originally Posted by HeadlessChicken

Out of curiosity, how proprietary are the stocks? Would I be able to fit a WA build stock onto the KJW?

According to KJW, it takes all AEG parts, except for the receiver. I'm curious to see if it takes GBBR parts as well.

[Rookie Ab]

The DD lite rail I put on mine fit nice.It has the same threads as the PTW and Prime WA uppers as well as G&P. The gas tube is some sort of steel ,and is a little bigger dia. than most.

The outer M4 style stock tube measures 1.120" so most stocks will slide on (some might be a bit sloppy though) my PTS CTR was a touch loose but a piece of tape inside tightened it up nicely.

Since then I have installed a Magpul PTS UBR. They said it wasn't possible but it on and is rock solid. It's not perfect ,but until someone comes out with a UBR tube with KJ threads, this install works.

What sort of GBBR parts are you wondering about,maybe I can check if I have that part on something else here.

[IMG][/IMG]

[HeadlessChicken]

Originally Posted by MoreToasties

According to KJW, it takes all AEG parts, except for the receiver. I'm curious to see if it takes GBBR parts as well.

Ah interesting...I've been eyeing this GBBR for a while now. Guess I'll see how much I get paid first this coming Friday.

[brixx]

very nice set up kody how is it going still love the realistic feeling.