A-Tec CMM4 Alu Mod

[Milligan]

It's aluminium, it's going to cut. If you expected it to last as long as an ASE SS lump you're kidding yourself.

If you feel that strongly about it you can get 2 steel baffles and the rest alu but that defeats the point I think.
There is always Ti...

 

[Offroad Gary]

i just ordered one today for my 25-06, i'll report back on how it stands up to 54.5gn of n160 rammed up it repeatedly!

 

[2428 miles]

i just ordered one today for my 25-06, i'll report back on how it stands up to 54.5gn of n160 rammed up it repeatedly!

Good man! I have had much the same thoughts about my .30-06 with 50grains of N150 storming through the alu mod! Let us know how you get on.
Cheers
M

 

[2428 miles]

Any more reports about the A-Tec CMM4 Alu performance and gas cutting...?

Gary, how are you getting on with it on your .25-06?

Cheers

Miles

 

[devilishdave]

Perhaps the Roedale with 2 steel baffles is the best comprimise....

Can you buy mods through the post?

#

My understanding is you could legaly buy a CF .22 moderator to fit on a .22 air rifle with no certificate. So there would be no issue sending it in the mail. The first time you put it on a CF rifle it becomes an item that must be on ticket and in theory it can not be taken off of ticket. It could then still be sent through the post but must be RFD to RFD.

Dave

 

[devilishdave]

I have mine on a 30.06, it does get hot and there is some gas cutting after 100 or so rounds but the gas gutting is not significant. TBH I am happy with the trade off of weight improoving the balance. If I have to replace the baffels after 5 or so years at £16 per unit that is better than replacing a T8 complete after 5 years.

Dave

 

[2428 miles]

TBH I am happy with the trade off of weight improoving the balance. If I have to replace the baffels after 5 or so years at £16 per unit that is better than replacing a T8 complete after 5 years.

Dave

Fair point, I’m just quite torn between the ASE SL5 and the A-Tec Cmm4.
I think the SL5 will be a safer option in that it should out last the alu mod and will not be subject to gas cutting in the same way but it is a little heavier.

I need to hurry up and make a decision but just can't decide!

 

[308boy]

Fair point, I’m just quite torn between the ASE SL5 and the A-Tec Cmm4.
I think the SL5 will be a safer option in that it should out last the alu mod and will not be subject to gas cutting in the same way but it is a little heavier.

I need to hurry up and make a decision but just can't decide!

or do what i did and buy the CMM6 Maxim which has stainless baffles. pretty impressed so far.

 

[SEVEN-WSM]

#

My understanding is you could legaly buy a CF .22 moderator to fit on a .22 air rifle with no certificate. So there would be no issue sending it in the mail. The first time you put it on a CF rifle it becomes an item that must be on ticket and in theory it can not be taken off of ticket. It could then still be sent through the post but must be RFD to RFD.

Dave

Dave

Airgun silencers are covered by the VCR act and therfore have to be purchased face to face, they can only be sent to an RFD and not to the end user. I am not sure if an RFD would take the chance of selling a £200+ C/F moderator for use on an airgun. I am pretty sure plod would take issue with that . and I'm positive you would need a slot on your FAC for one, even if you bought it to use on your "Air Rifle" and then stuck it on your C/F. I certainly wouldn't take the chance of losing my FAC for that especially in the current climate.

all the best
WSM

 

[devilishdave]

Dave

I certainly wouldn't take the chance of losing my FAC for that especially in the current climate.

all the best
WSM

Me neither but the law is confused, a SAK moderator could reasonably bu used on eiher an air rifle or a Rim fire. For the same mod you dont need a ticket to have it on an air rifle but fit it to a RF and you need to have it on ticket.

Dave

 

[SEVEN-WSM]

Dave

I'm sure we would both agree the law is at times an a$$

 

[timbrayford]

Dave

I'm sure we would both agree the law is at times an a$$

Just the sort of thing our representitive organisations ought to be taking up with the Home Office, if only they could find some backbone!

 

[2428 miles]

Well, at long last and after many months of deliberation I picked up my new mod on Saturday. I went for the Ase Utra SL5.
1[SUP]st[/SUP] impressions: Very well built, exceptionally short and neat and at 400grams is the same weight at the Titanium Arora. As much as I would love the Arora, its out of my price range.
The SL5 is aprox 180grams heavier than the A-Tec CMM4 but with reports of gas cutting after 100 rounds I’m afraid its Steel all the way for me.

The SL5 has a 10,000 round guarantee. By the time I have put 10,000 round down,
a) I will be broke as that’s £5k worth of home loads
b) I am sure there will be mods on the market made from Carbon Fibre and weigh 50grams by then! I know that the concept has already be born!

I will get some rounds through it next weekend and will let you know how I get on.

Thank you everyone for your advice and comments. The forum is a fantastic resource to help with these kinds of decisions. All credit to the members of the SD.

Best Regards

Miles

 

[luke wady]

as a engineer theres is no matrail that is really well siuted to makinkg sound mods hot gasses at high presure cut maetal that the end,
so metals are better that others but these are heavy and expencive, and £20 pound for a new baffel seems ok to me ,

 

[Effnjeff]

I use a steel CMM6 with only three baffles, which weighs 325g and is only 5" long.

 

[Brithunter]

Not a lightweight moderator but here is the stainless blast baffle of a Wildcat P8 after about 500 rounds through it:-

It's starting to show errosion. This mod has been used on my 25-06, 6.5x55 and a few rounds of .243. It had had about 300 rounds of 25-06 through it and that's a lot of gas .

It's also been cleaned regularly.

 

[Buck 243]

Has anyone got more info on david 1976's post about CMM4 instructions saying not to use plstic tip or 100 gr plus bullets through this mod. This seems a bit limiting to say the least, maybe I,m missing somthing but what would the differance be to the mod if you fired a 75gr soft point instead of a 75gr plastic tip round through it?

 

[JabaliHunter]

Has anyone got more info on david 1976's post about CMM4 instructions saying not to use plstic tip or 100 gr plus bullets through this mod. This seems a bit limiting to say the least, maybe I,m missing somthing but what would the differance be to the mod if you fired a 75gr soft point instead of a 75gr plastic tip round through it?

I also did not realise before I bought it that it stated in the instructions not to use bullets of 100gr or more and not to use plastic tipped bullets in it.

What it actually says is that for any moderator, it is not recommended to use bullets with a stability factor of less than 1.5 for reliable accuracy. Some rifles may not have a suitable rifling twist to adequately stabilise 100+gr 6mm bullets (for example, or 55+gr .223 bullets, etc.). In theory, firing an unstable bullet could cause the bullet to make contact with the moderator, but basically, if your rifle doesn't stabilise heavy for calibre bullets, then it won't shoot to its accuracy potential anyway, so you shouldn't be using them. I think the reference to plastic tipped bullets is probably a reference to, for example, the 6mm 105gr Amax and other long for calibre bullets...

 

[BWH]

I liked the noise reduction and weight balance of my CMM4 but found it cut badly and I put less than 100 rounds through it. I also did not realise before I bought it that it stated in the instructions not to use bullets of 100gr or more and not to use plastic tipped bullets in it. I was using a .243 and the moderator was marked to be used up to 6.5mm and at that size you would be expecting to use bullets heavier than this.

I have sold it and since ordered the new atec maxim with steel baffles and aluminium body.

It weighs more I believe about 370g for the 4 baffle version but is cheaper than the cmm4 was.

It's arriving on Friday so looking forward to testing it out.

David

I wondered how you were finding the Maxim? Are you pleased with it?

 

[Thar]

I shot 105gn A-max’s thought my CCM6 for a 6mm calibre rifle, I had them key holeing and could not keep a group on the paper at 50 yards (1-10 twist barrel) but never had a problem with baffle strike. Manufactures covering there Ar5e IMO, well my practical experience would indicated that.

ATB

Tahr