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Crewchief Monday, November 19th, 2007
Period of
Product Use:
Less than a month65 of 72 people found this review helpful.

4 years
Products Used:
Smart Parts ION, Tippmans, and a variety of other markers.
Marker Setup: My primary is a SITH ION tactical with a 98 Pro-E as a backup.
Rail covers maybe?
Strengths: Smart Parts quality tactical marker for a low price.
Weaknesses: Flashlight mount plug is hard to remove. Limited upgrades and limited compatibility with existing products.
Review: The S1 is a composite, high-impact, plastic shroud covering a smaller base marker. The feed neck is part of the external body. The internal body can be removed. The internal body consists primarily of a metal tube. The rear portion of the tube houses the bolt. The barrel threads are near the middle of the tube and the front of the tube covers 4-5 inches of the barrel. The board and removable solenoid are housed under the bolt section of the tube and held in place by bolts that also serve as the air line attachments. The board no longer extends into the trigger frame like the ION. The battery is still housed in the pistol grip. The outer body is largely cosmetic with a compartment to house a flashlight just below the barrel.


- Upgraded regulator which should be an improvement over the ION. This should be better at using CO2 but an anti-siphon, remote, or secondary regulator should still be used.
- Milsim body with flashlight mount.
- Rear accessible bolt for "easy" cleaning.
- Adjustable single finger trigger. (Upgrade to double trigger available soon)
- Small to medium sized 45 pistol grip.
- ION style electro-pneumatic design with similar electronics caped at 11 balls per second (Correction: Semi-auto fire mode only on stock board)).
- Easy-on button and audible sound for programming.
- Comes with a 9-volt battery installed.
- Air line has been painted black, nice touch.
- Barrel opening is larger than the stock barrel for more compatibility options.
- Box includes barrel, marker, instructions, registration card, and new barrel sock.
- Bolt action is supposed to be light enough to prevent or reduce chops without an electronic eye.
- Nice pistol-ish feel and feels lighter than it actually weighs.


- Flashlight mount plug is hard to remove. Apparently there is a locking screw hidden under the lower rail...I don't think this is in the manual.
- The marker uses a wide variety of hex head sizes making full disassembly a little difficult.
- The internals are not ION compatible so ION boards, bolts, feed necks, triggers, etc. are not compatible. (Based on comments a solid ION bolt may work)
- The feed neck is integrated and cannot be upgraded.
- The marker may not be compatible with some IONImpulse barrels. The stock ION barrel fits. The barrel inserts 4-5 inches into an opening. Freak backs should work but you may have to remove the freak stickers on the sides of the barrel.
- The bolt requires a rather large hex tool to remove. I think the easy of cleaning the marker has been slightly exaggerated. (Still easy to clean with the right tools)
- No tools are included and the instructions are a multilingual foldout poster that is hard to use and provides only limited information.
- Some rails are glued in place so they can't really be removed without creating an eye soar.
- Board is capped at 11 balls per second and no electronic eye is included.
- Upgrades and replacement parts are unavailable at the moment.
- The pistol grip covers are held on by hex head bolts making battery access difficult.
- Despite the plastic body it weighs only slightly less than a stock A5 (less than a pound difference).

Dispelling rumors:

- The marker is not Tippmann stock compatible. Update: Compatable stocks and adapters are now availabel. (I'm still a little sceptical about the attachment points though)
- There have been rumors of an aftermarket electronic eye upgrade. I don't see any openings in the feed neck or internal body to indicate that this rumor is true. Update: This is rumored to require an upgraded body
-Updated: It sounds like at least two board upgrades will be available soon!

- Make sure the regulator is turned all the way down before airing up for the first time and increase to desired pressure. I blew out my internal air lines shortly after airing up for the first time. (See dwell setting info in the following reviews)
- If removing the board from the body be very careful not to strip the hex heads. The two bolts that attach the board to the main body are made from a soft metal and can easily be rounded out.
- If you round out or strip any of the hex head bolts, use a rotary tool to cut a groove in the head so a standard screw driver can be used.

Conversion Considerations:

Using the S1 as a conversion marker does provide some interesting advantages and disadvantages over the ION.

Considerations for using the ION:
- The ION board extends into the pistol grip and can be difficult to relocate.
- The internal base of the ION is smaller than the S1.
- The ION is easier to completely disassemble.
- The ION has a wide variety of upgrades, replacement parts, and feed necks available.
- The ION feed neck screws into the internal ION body and no additional work is needed for the hopper attachment.
- The ION has the ASA for the regulator built into the lower receiver. Relocating the regulator requires some sort of ASA.

Considerations for using the S1:
- The S1 regulator ASA it bolted to the bottom of the barrel cover and could easily be relocated.
- The S1 internal body can be cut down to a much smaller size if needed, basically remove part of the barrel cover.
- The S1 board is more internalize making it a better fit for M-14 or sniper rifle conversions where a pistol grip isn't present.
- The biggest challenge with using the S1 as a conversion marker will be the feed neck. This is an integrated part of the outer body. If you want to transplant the internal body of the S1 to another body a feed neck solution will need to be devised. The internal body only has an unthreaded opening for the feed port.

Conversion Recommendations:

For an internal body transplant conversion I'd recommend the ION over the S1 primarily due to the feed port though the boards configuration does make the S1 a likely candidate for rifle conversions.
Conclusion: Overall I definitely recommend the S1. The price alone is a great selling point. If you need a good marker and a super high rate of fire isn't required this is a great buy! I think this will be a solid primary or backup and definitely a good beginner marker. I'd recommend this over a 98C, MR1, and any other similar priced markers.

Update: The price of the ION is dropping fast. You can get a new ION for $165 online. Something to keep in mind since ther price difference is so small.

9 out of 10Last edited on Thursday, January 10th, 2008 at 9:24 am PST

Review Comments
KAR98 Tuesday, December 4th, 2007 | 10:27 am PST
How do you change the Fire modes in the SP1?...
For what i've read it only Semi-automatic Marker...
Is it possible?.
Thank you.

Monkey Militia Thursday, December 6th, 2007 | 2:02 am PST
The SP1 bolt is identical to the ION, but you couldnt use 2 part bolts like the Hollowpoint or L7

iliveforthis99 Tuesday, December 11th, 2007 | 6:27 pm PST
You CAN remove the feedneck. And SP is making an adapter to accept 98 custom stocks.

cosmonaut Wednesday, December 12th, 2007 | 9:37 am PST
The flashlight plug comes off easily. You just have to take off the picitinny rail on the bottom of the gun and remove the silver screw underneith it that holds the plug in.

Crewchief Thursday, January 10th, 2008 | 8:58 am PST
I'll make a few revisions. Thanks for the comments. I'll have to take another look but the bolt doesn't appear to be ION compatible. The feedneck can't be removed unless they have changed the marker after the first release. The feedneck is integrated with the S1 outer body. The external clamping portion of the feedneck can be removed but the neck itself is still integrated. I'm glad to hear about the flashlight plug, I didn't see any mention of this in the instruction manual.

sledgehammer Monday, June 2nd, 2008 | 2:51 pm PST
Originally posted by KAR98
How do you change the Fire modes in the SP1?...
For what i've read it only Semi-automatic Marker...
Is it possible?.
Thank you.


sledgehammer Monday, June 2nd, 2008 | 3:06 pm PST
oops! so much for the previous post, Your Sp1 must be select fire and from what i understand the early models were not. If you do have select fire when you turn your marker on, quickley press and release the mode button which is the flashing red led, this will give you three shot burst, press again this will give you full auto press again and you go back to semi.

Ace-o-Spades Friday, July 25th, 2008 | 6:02 pm PST
how quiet is the marker itself?
my buddy owned an ion and it was one of the quietest markers (with stock barrel) i've ever heard. how does the sp-1's sound profile compare to the ion's?

guysullavin Sunday, December 21st, 2008 | 9:25 am PST
Its like listening to a cat purr, its really effing quiet.
I love my SP1, way better than the A5 I had

guysullavin Sunday, December 21st, 2008 | 9:26 am PST
Its like listening to a cat purr, its really effing quiet.
I love my SP1, way better than the A5 I had

Ace-o-Spades Friday, April 3rd, 2009 | 4:19 pm PST
Thanks, guysullavin.
By the way, I hear a lot of people saying that the center feed makes aiming difficult. I did not think so; I'm used to firing at a slight angle from center after shooting my TL-X for a long while. However, to help aim, I bought an occluded sight (where you look into it and keep both eyes open, and a dot will be projected onto your target). This does help with aiming a lot, and it doesn't matter that the center feed is right in front of it. Just a suggestion for those who don't like the center feed.

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