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Canted Spring - low velocity

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Basu
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Location: Salt Lake Kolkata

Canted Spring - low velocity

Postby Basu » Sat Jul 08, 2017 5:57 pm

My GenNex started hitting low at the target which I ignored initially.
The gun was very smooth as usual.
I was wondering as to why it was hitting low.
I checked the velocity by SimpChrony and found that it has lost 150 fps.
I opened the gun and then took out the piston.
Seal was perfectly alright and so was the spring, unbroken.
I noticed that I had pull the spring pretty hard to take that out from piston.
The spring was canted in either way and when cocked, it was giving pressure on ID of Piston , not allowing easy movement to produce full energy.
I changed the spring and the gun started giving awesome power.
Attaching pic.of canted spring.

Basu
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Not all those wander , are lost...............

pratik_mahale
Posts: 473
Joined: Sun Jun 28, 2009 12:59 pm
Location: mumbai

Re: Canted Spring - low velocity

Postby pratik_mahale » Sat Jul 08, 2017 7:11 pm

After how many shots



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Basu
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Location: Salt Lake Kolkata

Re: Canted Spring - low velocity

Postby Basu » Sat Jul 08, 2017 10:13 pm

After 1800 shots.
I suspect this started some 200 shots before.
Since the cocking was butterly ,so I had ignored that.
Now with new spring , it got back the power up to 7.4 fpe.

Basu


Not all those wander , are lost...............

avihkd
Posts: 31
Joined: Fri Nov 04, 2016 9:48 pm

Re: Canted Spring - low velocity

Postby avihkd » Sun Jul 09, 2017 12:17 am

Which spring hv u installed now?



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greenrifle
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Re: Canted Spring - low velocity

Postby greenrifle » Sun Jul 09, 2017 7:04 am

Hello Basu Da,
Have you observed any new developments or betterment in GenNex... Do you think that spring lost power very early or the design needs some changes for this weapon.. happy Sunday and happy Shooting..

GreenRifle

Sent from my MotoG3 using Tapatalk



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Basu
Posts: 1053
Joined: Wed Apr 08, 2009 7:14 pm
Location: Salt Lake Kolkata

Re: Canted Spring - low velocity

Postby Basu » Sun Jul 09, 2017 10:31 am

Dear green rifle,
The design of this AR is too good.
Maximum for a target shooter , a 100 gms increase in muzzle weight is recommended.
With new spring it got back it's power again.
This AR is sweetest .

Basu
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Not all those wander , are lost...............

pratik_mahale
Posts: 473
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Location: mumbai

Re: Canted Spring - low velocity

Postby pratik_mahale » Sun Jul 09, 2017 12:41 pm

That means Artemis may be having same problem.if you need to change the spring after every 1500 shot than its major reliability & consistency problem



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Basu
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Joined: Wed Apr 08, 2009 7:14 pm
Location: Salt Lake Kolkata

Re: Canted Spring - low velocity

Postby Basu » Sun Jul 09, 2017 12:57 pm

Dear pratick,
I can not say about Artemis because I did not use for a long time.
My Sport does not have this issue so far , I wonder as to why it happened to GenNex .
I think quality of spring matters a lot.

Basu


Not all those wander , are lost...............

sam 47
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Joined: Tue Jul 07, 2015 5:49 pm
Location: kolkata

Re: Canted Spring - low velocity

Postby sam 47 » Sun Jul 09, 2017 1:40 pm

pratik_mahale wrote:That means Artemis may be having same problem.if you need to change the spring after every 1500 shot than its major reliability & consistency problem

Sir,for Artemis, it is around 3500 shots, not 1500. It is more of spring sagging problem, where the spring shortens but remains relatively straight. I suspect pre-load & softness of spring to be the reasons but might be mistaken. I strongly believe that Artemis can gain much durability & maybe even little MV with a stronger spring.


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