Jump to content

Krytac Spring upgrade


NathyB
This thread is over three months old. Please be sure that your post is appropriate as it will revive this otherwise old (and possibly forgotten) topic.

Recommended Posts

So my Krytac shoots about 293fps stock I put a guarder m100 Spring in and it took it up to 380fps I now have a sp90 Spring does any one else have this spring installed in a Krytac crb and can confirm the fps before I strip the gun, cheers 

image.jpeg

Link to comment
Share on other sites

Not sure about your question, but I hope

you realise that since a Krytac CRB has automatic capability, you actually own a firearm at this point. Under the VCRA, after it has passed around (330, 340?) if it hasn’t been restricted to semi-automatic only, it’s a firearm.

Link to comment
Share on other sites

Just strip the gun and test it lol. Best way to figure out whether it will work.

Link to comment
Share on other sites

On 11/03/2018 at 9:35 AM, NathyB said:

So my Krytac shoots about 293fps stock I put a guarder m100 Spring in and it took it up to 380fps I now have a sp90 Spring does any one else have this spring installed in a Krytac crb and can confirm the fps before I strip the gun, cheers 

image.jpeg

Are you trying to run with an 11.1 lipo??  If so try a 7.4 and see if that helps. I run a m105 in my lvoa a its slightly hot 355 to 365 with the 11.1 not yet tryed with a 7.4  but on my aps it can make a 20fps diffrence. I going to clip the spring anyway as i want it site legal and want the extra rof that comes with the 11.1

Link to comment
Share on other sites

8 hours ago, ImTriggerHappy said:

Battery makes no difference to fps.

 

Every gun is different even those from the same manufacturer just fit the spring and see. 

 

Those figures on the m100 are a little high though which makes me think something is not right.

Battery should not make a diffrence i agree . Yet i have found that it can . Wether its due to the quicker compression and release of spring i dont know.

Link to comment
Share on other sites

  • Supporters
41 minutes ago, Whompa73 said:

Battery should not make a diffrence i agree . Yet i have found that it can . Wether its due to the quicker compression and release of spring i dont know.

 

Nah......

 

Think you would have to have the gun cycling at say 100rps

Vs

Stalling mid cycle and ultra slowly crawling to slip of last tooth on release

THEN you "might" have say 1mm max difference on spring compression/release

Taking one tooth when Short Stroking as say a max of 15fps per tooth (maybe 12-13fps)

a 1mm spring compression difference would equate to say 4 fps tops

BUT TBH this is going some to get this variation of spring compression

most likly just a bit of random luck/slack in drive chain or wear gives a fly's pubic hair variation

 

Plus you get variation of 5 to 10 fps anyway between shot after shot

minor imperfections in bb's exact weight, slight imperfect seal on bucking lips etc....

 

The biggest variation in fps is to do with a leak, say sealing on bucking lips

(softer buckings blow on higher fps)

But often if isn't bucking seal or torn/damaged bucking etc....

 

One of biggest areas is piston o-ring losing 30fps or more

Or a bad leak/loose cylinder head etc....

 

Speed will not alter the fps - loads of other factors will

lack of good compression and ultra great seals is where nearly all energy is lost

 

No point putting in a m110 - m120 spring to compensate for $hit seals

stuff just works harder and runs warmer/slower to make up for inefficiency elsewhere

 

If you got a drop fps it will very very likely be down to three things....

 

Piston O-ring crap seal

Torn/damaged bucking

Extremely worn/faded spring

(though you would have to stupidly leave it pre-cocked for a while in general)

 

Stuff usually wears & not improves over time like fine wines

Careful of grease you use for o-rings, many eat up rubber o-rings

So a couple months later your o-ring will no longer seal well

 

Other than that, a part failure or bad assembly will cause a drop in fps

 

Or really daft thing to ensure your chrono-ing with 0.20's and not 0.25's

(just make sure you are reading 300fps on 0.20's not 0.25's)

 

If your APS varies 20fps that is a seal issue

the o-ring could get warmer cycling faster from still

but should after a few shots start to seal better

the warmth will help the o-ring expand & seal better increasing fps

 

BUT in reality that increase is down to $hit seal to begin with

Do a load of compression tests and you get so-so compression often

but after a few tests/pumps it improves a little

Really what you want is great compression to begin with in the first place

It is something not always easy to attain straight away

You can get a good cylinder/piston/piston o-ring within a few attempts

Or you can spend ages messing around with combos especially in piston head & o-ring

 

Some piston heads are just complete crap and believe it or not

some cheapo stock piston heads are very good if you set it up with good o-ring

bought a number of piston heads and quite a few were pretty crap or worse than some stock

(G&G is the exception, very rarely have I got really great seals on G&G piston heads)

But some china guns, the piston heads are quite good if you just replace the o-ring

(often china guns will over volume a smidge with crap o-ring seals to compensate)

 

Getting good compression is vital, and using stuff like synthetic super lube is a must

Other grease will quickly rob you of fps when o-ring gets perished by wrong grease

Link to comment
Share on other sites

On 12 March 2018 at 8:28 AM, MemeySwagLord said:

Not sure about your question, but I hope

you realise that since a Krytac CRB has automatic capability, you actually own a firearm at this point. Under the VCRA, after it has passed around (330, 340?) if it hasn’t been restricted to semi-automatic only, it’s a firearm.

I swapped the spring back to stock once I realised it Was to high

Link to comment
Share on other sites

14 hours ago, Sitting Duck said:

Snip

One of biggest areas is piston o-ring losing 30fps or more

Or a bad leak/loose cylinder head etc....
Snip


Agreed, this goes back to my Krytac experience mentioned in this other thread... 1 o ring change jumped my fps from 300 to 340+ lol. 

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...