Crosman Air Pistol Owners Forum

Crosman air pistol - General => Crosman air pistol - General discussion => Topic started by: CHRIS K on May 08, 2012, 05:47:00 PM

Title: breech bolts
Post by: CHRIS K on May 08, 2012, 05:47:00 PM
newbie here again. why am i seeing "extended bolts" or "hollow bolts. whats the purpose?
should i get one too?
Title: Re: breech bolts
Post by: Xgecko on May 08, 2012, 06:00:32 PM
the hollow bolt allows for a different some would say better depending on the pellet  airflow, the extended bolt seats the pellet deeper in tha barrel allow cleaner push....Need is an interesting would though in most cases it should be replaced with WANT or even lusting after
Title: Re: breech bolts
Post by: breakfastchef on May 08, 2012, 06:02:55 PM
Extended and hollow bolts push pellets consistantly forward of the exhaust port in the barrel and consistantly set the pellet in the same postion each time. Each bolt works well and can provide minimal fps gains. I use both types and do not have a preference.
Title: Re: breech bolts
Post by: KevinP on May 08, 2012, 06:03:56 PM
Quote from: Xgecko on May 08, 2012, 06:00:32 PM
the hollow bolt allows for a different some would say better depending on the pellet  airflow, the extended bolt seats the pellet deeper in tha barrel allow cleaner push....Need is an interesting would though in most cases it should be replaced with WANT or even lusting after

;D ;D  Lusting is always more gooder .... :-*
Title: Re: breech bolts
Post by: Xgecko on May 08, 2012, 07:39:40 PM
In the motorcycle world upgrades of minimal function are referred to as Farkle, on bicycles its often called bling, on DH skateboard we refer to is as pimping regardless of the term it is usually considered when one doesn't like the "look" of something rather than trying to improve how something works and lust is always involved
Title: Re: breech bolts
Post by: BDS on May 08, 2012, 07:52:39 PM
Yup, you need one, extended bolt is fine, they both do the same thing :-*
Title: Re: breech bolts
Post by: millipede on May 09, 2012, 05:13:42 AM
i cant remember who said it but i guess the long probes work better for HPA than hollow probe. a hollow probe will seat all different kinds of pellets in the exact same position in the barrel while a long probe pushes the pellet from inside the skirt, and depending on the depth of the pellet skirt, will position differently in the barrel
Title: Re: breech bolts
Post by: 1377x on May 09, 2012, 05:29:34 AM
with high powered guns the hollow probe limits output
the extended probe doesnt
if looking for better accuracy and a little more power,its worth the investment
if its for a .177 go with the extended probe
Title: Re: breech bolts
Post by: Noah on May 09, 2012, 07:42:13 AM
Quote from: Xgecko on May 08, 2012, 06:00:32 PM
the hollow bolt allows for a different some would say better depending on the pellet  airflow, the extended bolt seats the pellet deeper in tha barrel allow cleaner push....Need is an interesting would though in most cases it should be replaced with WANT or even lusting after

Mmmmmmkay. Why not make a bolt that is both hollow AND extended?  ??? :o
Title: Re: breech bolts
Post by: 1377x on May 09, 2012, 07:43:07 AM
Quote from: Noah on May 09, 2012, 07:42:13 AM
Mmmmmmkay. Why not make a bolt that is both hollow AND extended?  ??? :o
hollowprobe bolts are extended
Title: Re: breech bolts
Post by: Noah on May 09, 2012, 09:00:58 AM
Quote from: 1377x on May 09, 2012, 07:43:07 AM
hollowprobe bolts are extended

:o :o :o
Title: Re: breech bolts
Post by: HappyHunter on May 09, 2012, 11:50:07 AM
Quote from: millipede on May 09, 2012, 05:13:42 AM
i cant remember who said it but i guess the long probes work better for HPA than hollow probe. a hollow probe will seat all different kinds of pellets in the exact same position in the barrel while a long probe pushes the pellet from inside the skirt, and depending on the depth of the pellet skirt, will position differently in the barrel

I posted this link a while back for another member on this topic. Interesting results (9 posts down):
http://www.airgunforum.ca/forums/topic43657.html?sid=66a565665e657a5c817263ba1238f8ab (http://www.airgunforum.ca/forums/topic43657.html?sid=66a565665e657a5c817263ba1238f8ab)

I used to use flow through bolts in most of my guns (still have it in one), but since first reading that post, and having this (pic below) happen to me, I've switched to extended probes.
(http://i1100.photobucket.com/albums/g401/windrifle/HollowProbe001.jpg)

Todd
Title: Re: breech bolts
Post by: 1377x on May 09, 2012, 03:46:58 PM
what happened there???
Title: Re: breech bolts
Post by: BDS on May 09, 2012, 04:20:37 PM
Quote from: 1377x on May 09, 2012, 03:46:58 PM
what happened there???

Looks like the small dia that was turned down for the o-ring gave out while slamming a pellet home to the breech? ???
Title: Re: breech bolts
Post by: HappyHunter on May 10, 2012, 12:01:47 AM
Quote from: BDS on May 09, 2012, 04:20:37 PM
Looks like the small dia that was turned down for the o-ring gave out while slamming a pellet home to the breech? ???
Close....turns out the probe diameter was .217", whereas the theoretical bore size should be .216 - .2168" (would explain why it was "snug" when I locked the bolt into place...), and the "hollow" part of probe was bored too deep - only about 1/32" left between probe base and o-ring shaft...

Between the two minor discrepencies, the bolt finally failed after about 250 - 300 shots.

Todd