Author Topic: Air Javelin Pro (Read 10211 times))

Rob M · « **Reply #20 on:** April 24, 2022, 02:10:36 PM »

wow , awesome , its gonna be a different gun with those new springs. curious to see what the gains are with the adjuster.

Rat Sniper (AKA: PaulT58) · « **Reply #21 on:** April 24, 2022, 04:14:12 PM »

Okay, so I couldn't take it anymore! I went out into the woods behind the house and dry fired it twice, just to get a feel for the trigger. gracious, what a difference! I can't believe the difference a couple spring and a little polish will do! I haven't tested the trigger pull weight (should have before doing it), but I can tell it's less than half what it was before and much smoother. To a point where it's going to be a joy to shoot instead of a struggle! No Popeye forearms for me!

I also did another quick mod. The slide rail the Fore Grip slides on just happens to be the same general dimensions as a Picatinny rail, minus the slots! So, using the edge of a file, I made a slot so I can now mount a bipod!

Since the for grip is essentially just cosmetic on the AJP, it would have been nice if Umarex could have just went a heat and moulded 3-4 slots into the front end of that rail for this purpose. Oh well...

One last thing, there is a 2.5mm Allen wrench included with the rifle. For the life of me I could not figure out what it was for since the trigger is not adjustable and the hammer spring adjuster is 4mm. Turns out it's for degassing the rifle. Yep, on the fill cap, right between the gauge and burst disc is a small opening. In that opening is a tiny set screw you can use to degass the rifle if needed!

Rat Sniper (AKA: PaulT58) · « **Reply #22 on:** April 26, 2022, 04:56:50 PM »

I got some time to do some shooting today. The standard Arrows with the 50 grain tips (170 grain total weight) are shooting right at 344 FPS. I swapped the tips to 100 grain field tips (now 220 grain total) and the velocity dropped to around 295 FPS, and range dropped to no more than 20 yards. The scope is maxed out on elevation in order to get the heavier arrows hitting the bullseye.

I swapped to the 100 grain tips to zero at that weight since the small game tips are also 100 grain. Now that it's zeroed, I'm ready to attemp to take a rat with it! I did swap the scope to the ATN X-Sight II so I can capture the shot on video. If I actually hit it, it should make for an interesting video! But, getting set up and being able to take a shot at 20 yards, when I'm typically set-up at 40 yards will be a challenge. Hopefullt, the rat will cooperate!

Also, while I had it set up with the chrony, I tried adjusting the hammer spring tension to see if it increased velocity. It actually did just the opposite! 3 full turn in dropped velocit to around 330 FPS, so I backed it back off to regain the 344 FPS. I may have to source a replacement spring and try clipping a couple coils from it to see if a shorted spring will increase velocity some.

Rob M · « **Reply #23 on:** April 26, 2022, 05:06:36 PM »

thats really odd. must be that the poppet bottoms out internally with more hammer , and restricts the air path

Rat Sniper (AKA: PaulT58) · « **Reply #24 on:** April 26, 2022, 05:14:20 PM »

Yea, I have no idea. But, I don’t want to mess with the stock spring just in case! If I can find another spring I can experiment a bit and see if a shorter or lighter spring makes a difference.

Marco25 · « **Reply #25 on:** April 26, 2022, 11:56:25 PM »

Hi Rat Sniper/PaulT58
So how did the trigger turn out. Is the weight good and still safe. Did you do any bump tests. Just curious because I would like to do mine

Thanks Marco

Rat Sniper (AKA: PaulT58) · « **Reply #26 on:** April 27, 2022, 08:29:13 AM »

Quote from: Marco25 on April 26, 2022, 11:56:25 PM

Hi Rat Sniper/PaulT58
So how did the trigger turn out. Is the weight good and still safe. Did you do any bump tests. Just curious because I would like to do mine

Thanks Marco

The mod did nothing to shorten the trigger pull, so it's still as long as it was, it's just much lighter and smoother. It's still way heavier than any other trigger on any of my other rifles, but a vast improvement over what it was! I have not tried a bump test, but I'm pretty certain it will be fine since I did not alter any of the original geometry of the trigger mechinism, I just removed any burs and polished the contact surfaces so it's much smoother now. The lighter springs and polishing didn't change the engagement point with the hammer, so you still have the full amount of sear engaged with the hammer when cocked. Had there been a way to lessen that engagement then I would have been concerned. The final break, while much smoother than it was, is still quite heavy, but it's much easier to hold on target.

Marco25 · « **Reply #27 on:** April 27, 2022, 08:12:55 PM »

Thanks for the reply on the trigger mod. A lighter pull to stay on target is just what it needs.

Thanks again Marco

Rat Sniper (AKA: PaulT58) · « **Reply #28 on:** April 27, 2022, 08:23:07 PM »

It made a huge difference! I just uploaded a video to the hunting gate, I just took my first rat with it!

Marco25 · « **Reply #29 on:** April 29, 2022, 12:27:13 AM »

I did the trigger spring mod and polish on my air javelin this afternoon and it is a big improvement over stock configuration. It only took about 30 minutes to complete. Thanks rat sniper for taking the time to share it with the forum.

Marco

Rat Sniper (AKA: PaulT58) · « **Reply #30 on:** April 29, 2022, 08:30:36 AM »

Quote from: Marco25 on April 29, 2022, 12:27:13 AM

I did the trigger spring mod and polish on my air javelin this afternoon and it is a big improvement over stock configuration. It only took about 30 minutes to complete. Thanks rat sniper for taking the time to share it with the forum.

Marco

You're most welcome! I'm glad it helped improve your Air Javelin!

Rat Sniper (AKA: PaulT58) · « **Reply #31 on:** April 30, 2022, 12:59:42 PM »

Yesterday I finished the AJP Project by painting the fore grip to match the Butt Stock. It's all Dark Army Green now. At a later date, I may repaint the entire gun (since it's pretty much all plastic) with one of my Redneck Camo paint jobs! That may be a winter project...

Nvreloader · « **Reply #32 on:** May 02, 2022, 03:09:09 PM »

Paul
If you haven't seen this info before, check this out: there is 5 parts,

https://www.pyramydair.com/blog/2020/07/umarex-air-javelin-airbow-part-5/

Hth's
Don

Quote from: Rat Sniper (AKA: PaulT58) on April 30, 2022, 12:59:42 PM

Yesterday I finished the AJP Project by painting the fore grip to match the Butt Stock. It's all Dark Army Green now. At a later date, I may repaint the entire gun (since it's pretty much all plastic) with one of my Redneck Camo paint jobs! That may be a winter project...

Rat Sniper (AKA: PaulT58) · « **Reply #33 on:** May 02, 2022, 05:25:37 PM »

Quote from: Nvreloader on May 02, 2022, 03:09:09 PM

Paul
If you haven't seen this info before, check this out: there is 5 parts,

https://www.pyramydair.com/blog/2020/07/umarex-air-javelin-airbow-part-5/

Hth's
Don

Quote from: Rat Sniper (AKA: PaulT58) on April 30, 2022, 12:59:42 PM
Yesterday I finished the AJP Project by painting the fore grip to match the Butt Stock. It's all Dark Army Green now. At a later date, I may repaint the entire gun (since it's pretty much all plastic) with one of my Redneck Camo paint jobs! That may be a winter project...

I did see that Don! Lots of relevant information, even if it is the CO2 version! I just mounted a Hawle XB1 Crossbow scope on it and sighted it in with the 170 grain arrows. The screws, pencil erasers and adhesive should be here tomorrow, so I can start assembling and testing my Wat-Wacker Arrow Tips! I got ¾" Stainless Steel screws, but now I'm wondering if I should have gotten aluminum screws to keep the weight down? I'm really hoping they don't weigh much over 50 grains! I guess time will tell...

Rat Sniper (AKA: PaulT58) · « **Reply #34 on:** May 04, 2022, 04:07:15 PM »

Got my parts in to build my Wat Wacker Arrow Tips! These are yet untested because at this point I'm not sure how to test them! I'm really quite pleased with how they turned out, I just super glued a #8-32 X 3/4 in, Grade 18-8 Stainless Steel Phillips head Machine screw into a Hi-Polymer White Cap Eraser, put a small o-ring on the screw to seal in the air and screwed them onto the arrow. They feel very secure and to my amazement the tips weigh exactly 60 grains, just 10 grains more than the stock Field Tips, so I'm hoping they perform as well as the standard arrows.

I just need to find some time to ensure they are on target because I already have another fat rat hanging out at the feed station waiting to be whacked!

customcutter · « **Reply #35 on:** May 04, 2022, 04:11:21 PM »

Whack'em and stack'em!

Rat Sniper (AKA: PaulT58) · « **Reply #36 on:** May 04, 2022, 04:27:39 PM »

Quote from: customcutter on May 04, 2022, 04:11:21 PM

Whack'em and stack'em!

I'm going to erase them, it will be as if they never existed!

Nvreloader · « **Reply #37 on:** May 04, 2022, 10:29:28 PM »

Paul
Make sure that tapered head don't plane on you,
adjust the tapered end to sit 12/6 when lined up, if it does,
cut about 1/8" of the tapered end and try again.

I used to use a 38 Spcl case glued on the end of arrows, called "Splat ends",
will completely travel thru sage bunnies, with a big hole and Dirt napped bunny,
right there.......

ps, carry a water jug as you have to wash off the mess.......LoL

Don

Rat Sniper (AKA: PaulT58) · « **Reply #38 on:** May 17, 2022, 01:44:01 PM »

I received my package from Umarex yesterday, they replaced it with a new one, so I'll probably never know what actually failed on the last one!

This time, I took a measurement of the trigger pull prior to working on it. The first reading (see below) was 10 lbs 10.1 oz, the second was 10 lbs 8 oz and the third was 9 lbs 11.9 oz! I'll test it again after I polish all the contact surfaces and replace the springs with lighter ones.

This one is shooting slightly faster than the last one, but still well under the advertised 370 FPS! Here is a 7 shot string from 4000 psi down to just under 3000 psi:

Shot count: 7
Low: 348
Hi: 357
Avg: 353
Spread: 9
STD Dev: 3.1
357
355
354
353
350
351
348

The last the broken AJP averaged 344 FPS over a 5 shot string, this one is averaging 353 FPS over 5 shots.

After zeroing it, I tried the Wat-Wacker tips! These didn't work quite as I imagined, but I'm sure they will smack a rat! They penetrated my arrow backstop rather than bouncing off as I was hoping. They also proved to be a one time use item! I won't be shooting them into my arrow backstop any more because they really tore some holes in it! Below is an after picture of the tips and the target I was shooting that was placed in from of the arrow backstop. The shot that is centered, but low, was after a scope adjustment. It still needs to go up about 8 clicks, but I only made 3 Wat-Wacker arrows, so will need to build some more and figure out something else to use as a backstop!

Rob M · « **Reply #39 on:** May 17, 2022, 02:29:07 PM »

awesome !!! now we know how bad the factory trigger is

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Air Javelin Pro

Author Topic: Air Javelin Pro (Read 10211 times))