Crosman 2100 Trigger Mod:
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Crosman 2100 Trigger Mod:
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Topic: Crosman 2100 Trigger Mod: (Read 1991 times))
Fatman
Shooter
Posts: 13
yes
Real Name: Thomas
Crosman 2100 Trigger Mod:
«
on:
March 27, 2017, 10:28:40 PM »
Warning: Really long and wordy. If you are interested, grab a cup of coffee or a beer as this
will take a while!
I always fancied the 2100 for its classic design. Some other purchase always got in the way of
of getting one and the price kept going up. Finally had enough in the my limited air gun kitty to
pull the trigger on a refurb direct from Crosman. $50.00 plus some change delivered to my door.
Gun arrived in about a week in perfect condition. Looked “as new” to my eyes. Metal receiver
(OK pot metal), nicely done synthetic stock and decent weight for what it is. Nice finish,, clean
barrel and crown, decent buckhorn sight and then there’s that trigger! I have never experienced a
trigger like it and I’ve been doing this for more than half a century. It felt like dragging a trash
can full of bricks down a long gravel driveway, only worse.
This is certainly not the first 2100 trigger mod post and you may have a mod of your own that you
prefer. This is one that works for me and it produces a very short, crisp single stage (target ) trigger
with almost no creep and almost no over travel when properly adjusted (and it is adjustable). And
yes it will easily pass the “BumpTest”.
I’m no fan of safeties. I can’t count the times I’ve heard “but the safety was on” after the gun went
off. If you strongly disagree with this, you should leave now. Only responsible adults read on.
Disassembly of the receiver is easy. Three screws and presto, the little spring at the top disappears
forever. There are several YouTube tutorials on the disassembly and the re-assembly process, but
none will prepare for the torment and frustration of getting it back together again. It can be done
but only by the most determined and patient among you. No exaggeration.
Ok, you have it apart. You might want to order a sear and a couple of the small springs for the BB
detent from Crosman (just in case). Although, if you are reading this you probably won’t be using
BBs and it seems that a hardware store spring cut to length works just fine. It works for me.
The sear is a rather poor design. To pivot from full engagement to release it must move the striker
back over 1/16” against its compressed spring. This alone adds a significant weight to the trigger pull.
You can check this yourself. With a compass set to the distance from the center of the pivot to the
sears face, make a template to show how the face should be a curved shape. The obvious cure here
is to radius the face of the sear to match the template, but that will destroy the surface hardening.
It can be re-hardened, but that’s something I’m not conversant with so I didn’t go that route.
The first part of this mod is to remove just under 1/16” from the top of the sear to reduce engagement.
This not only shortens the pull but it also reduces the distance the striker is forced back against the
spring. A Dremel is your friend here, but go easy as you don’t want to overheat things and destroy the
surface hardening on the face of the sear. Clamp it in a smooth jaw vice (heat sink) with just the tip
exposed, and remove a little bit at a time to keep things nice and cool. It’s the tip that you are removing,
leaving the top flat but sloping very slightly downward as you move away from the sear face. As the top
surface is a low wear area, it shouldn’t affect longevity.
A bit of polishing on the sear face and the contact area of the striker will further improves things but go
easy as the parts are surface hardened only. You only want to remove the worst tool marks. Polish in
the direction of travel not across it. Some small imperfections will help hold the Moly past we’ll be adding
later so it’s not perfection we are looking for. The rounded area of the trigger where it contacts the sear
and the co-responding area on the sear should be polished as well.
Now for the adjusting screw. Use a 4-40 tap and socket head screw here. Examine the trigger guard
and you will see that there is an area at the back (about 3/4 “down from the top) where you can just
fit a screw between the hole for the safety and the inside of the trigger guard behind the trigger. It is
positioned so that the screw tip will make contact with the bottom rear area of the triggers safety
extension. The hole needs to be drilled just to the left of the mold separation line on the trigger guard
to position it correctly. Stop the tap just short of completely finishing the threads to provide a snug fit
to stop it from loosening once set, or you can use Blue Locktite once it’s properly adjusted.
The sear pivot pin was OK but could do with a bit of polishing with 600 wet or dry but go easy as you
do not want to overdo it and introduce any slop here. The Trigger pivot pin was very rough and needed
polishing.
As this mod works by partially pulling the trigger, the safety will be in the way and must be left in the
off position for the mod to work. You may be able to trim the trigger safety extension just the right
amount for it to work, but as I have never trusted safeties I didn’t even try. The interlock device to the
rear and above the trigger will also cause interference and should be discarded. Careful fiddling may
allow it to work but I didn’t feel it was necessary and simply left it out.
The Trigger/Safety spring should be bent to lighten the trigger pull but don’t go overboard as it will
make re-assembly that much harder. The Sear spring was replaced with a lighter hardware store
spring cut to the same length.
Before reassembling things, the rough sides and edges of the trigger should be touched up with 600
wet or dry and the rough casting surfaces of the trigger slot in the receiver dressed smooth. Don’t
go crazy here as it will allow slop in the trigger. I prefer using Moly on the mating surfaces of the
trigger, sear and striker. I read somewhere that Moly is the enemy of pot metal so go easy. I use
White Lithium Grease every where else. I have what looks to be a lifetime supply and it has served
me well so it’s what I use.
As I will never be using BBs in this gun I left out the BB follower and spring and placed a piece of tubing
in the groove to help prevent dirt from getting into the mechanism. This also makes re-assembly easier.
I cut a short length of hardware store spring (from memory as the original is still MIA) for the BB detent.
You might be able to leave it out completely but I put it back as I didn’t want to have to take everything
apart again if it was important.
When reassembling you have to leave out the trigger adjusting screw until it’s all back together. You also
need to insure that the Safety button is in the “Fire” position and the trigger is back enough to clear the
front edge of the trigger slot. Once you have it all back together you can insert the adjustment screw. You
will need to pull the trigger back a bit so the screw can engage the bottom of the triggers safety extension.
Using a flashlight, you can see inside the rear of the trigger cutout to check.
If all is well and you can cock and dry fire it, you can proceed with adjustment. Cock it and screw in the
adjustment screw until it just fires. Back the screw out until it just holds and will just pass a Bump Test.
You can now see how long the adjustment screw needs to be and you can shorten it so it doesn’t protrude
too far. Reinstall it and when it will just pass the Bump Test, you will be right at what is designed to be the
sweet spot.
You will notice that the Trigger is well back from its original position. Having located its new position you can
now proceed with the over-travel screw. On mine it’s about 3/8” forward of the adjustment screw (on the
bottom of the trigger guard). Drill and tap another 4/40 hole in this location. Keep it at the same angle as
the trigger adjustment screw for appearance sake. Although I got mine at a bit of a different angle it works
just fine. Adjust this screw inward until the trigger just refuses to release and then back it out till it just
releases. It can now be cut to length and reinstalled. As the trigger guard is a bit thin here I used Locktite
to help stabilize it and keep it from turning on its own.
Hope this is useful. Sorry it’s so long. It made a huge difference in my 2100 and thought it might be
worth sharing.
Cheers,
Fatman
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Annapolis, MD
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Real Name: Bill
Re: Crosman 2100 Trigger Mod:
«
Reply #1 on:
March 27, 2017, 10:37:43 PM »
Been waiting a long time for a trigger mod for these guns..... any chance of getting some pictures?
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From deep within the Rabbit Hole, Alabama
Charter Member Of The Secret Squirrel Society 20FEB202
Fatman
Shooter
Posts: 13
yes
Real Name: Thomas
Re: Crosman 2100 Trigger Mod:
«
Reply #2 on:
March 27, 2017, 10:45:52 PM »
Hi Old Timer:
Sadly no pics. Don't have a camera and wouldn't know how to post pics if I did. That's the reason that the post is so long winded. I try to make up for my lack of digital expertise (and equipment) with detailed instructions.
Cheers,
Fatman
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Annapolis, MD
A.K.A. Tommy Boy
No High Quality Guns Here. All "Bottom Shelf" Air Rifles Small Game Hunter
GTA Senior Contributor
Posts: 9659
Rusty the Dog & Elvis the Cat Pals Forever
Real Name: Tom
Re: Crosman 2100 Trigger Mod:
«
Reply #3 on:
March 27, 2017, 10:50:32 PM »
I Like this !...Have 2100.. and must mod trigger after reading this ! Thank's - Tom (no computer skills but just taught myself how to post pictures 4 weeks ago)
«
Last Edit: March 27, 2017, 11:07:51 PM by T.Wood-68
»
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The North Woods - We have 2 seasons, Winter & Mosquito/Tick season
********* My Menagerie of Bottom Shelf Air Rifles *********
.25 cal. Hatsan 125TH Magnum - Coil Spring
.25 cal. Hatsan Edge - Crosman NP Gas Spring (Now a Mini Magnum - Thank's to mikeyb)
.22 cal. Walther Talon Magnum - Coil Spring (A Hatsan 125 Magnum)
.22 cal. Gamo Magnum GR - Coil Spring
.22 cal. Crosman Summit Ranger - NP2 Gas Spring
.22 cal. Crosman Diamond Back - NP Elite Gas Spring
.22 cal. Umarex Surgemax Elite - TNT ReAxis Gas Spring
.177 cal. Hatsan Striker - Vortex Gas Spring
.177 cal. Stoeger S3000C - Coil Spring
.177 cal. Umarex NXG APX - Multi Pump
The Crosman Nitro Gas Spring conversion parts in the Hatsan Edge were a gift from
mikeyb
The 22 cal Walther Talon Magnum Rifle - A 22 cal. Hatsan Edge/ Striker Barrel - The Edge rifle stock on the Hatsan Striker - were gifts from
SteveP-52
A Picture of Some of My Rifles:
>
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avator
GTA Moderator
GTA Senior Contributor
Posts: 50119
The best "Bad Dog" I ever had.
Real Name: Bill
Re: Crosman 2100 Trigger Mod:
«
Reply #4 on:
March 27, 2017, 10:51:20 PM »
LOL...Old Timer... pretty good assessment.
I have several of these including the AirMaster 77, a 766, a 2200 magnum and to 2100. I have installed a lighter sear spring and considered the sear mod you describe here. I never even considered the screw mod but I can definitely see how it would work. Looks like I'm going back in.
Thanks
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From deep within the Rabbit Hole, Alabama
Charter Member Of The Secret Squirrel Society 20FEB202
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Crosman 2100 Trigger Mod: