I bought this .22 Maximus from Midway for $135 about a year back. Figured it would morph into something sooner or later.
![](https://i.imgur.com/LX9gK4m.png)
So, since my Christmas gun was delayed and I was bored as I haven’t got out much with the temps in the 25-35F range and lots of rain and snow for the last couple weeks. So, I got the brand new never fired Maximus out and proceeded to tear it apart.
First thing I did was dive into my breech collection. Still have a few of the old BNM breeches, that take the Marauder magazines, so grabbed the only .177 there cuz I don't have a .177 PCP yet.
Found I still had an old shroud with baffles that fit the breech as well so, even though it was for a .22 I grabbed that and picked up the matching barrel band too.
Found a power adjuster in one of my boxes and the gun thought it should have it also.
What to do for a barrel? Then noticed I still have my Impact 500mm .177 barrel and thought I heard the liner saying softly use me.
![](https://i.imgur.com/qSrz7Le.png)
Then came all of that werq;
I had to make adapters for the liner to make it fit in the BNM breech so used some brass stock I had on hand.
Then as usual the breech can't go on with just that tiny 4/48 screw holding it in the middle. So, I drilled the new breech, all the way through, up front with a #29 bit and a larger one on top to allow the screw head to go through. I can put a #12 set screw in the hole. Then drilled and tapped the tube to accept the new 6/48 screw to hold it better.
![](https://i.imgur.com/XRsgKVU.png)
Decided to tap the breech up front so I can secure the liner with o-rings. Like FX does on the Crown. It was a pain to do and I messed the flats up in the vise while threading the piece. The threads are a bit sloppy but everything tightened up securely. I was impressed that the five squished up o-rings, behind that brass nut, really hold the liner tight.
![](https://i.imgur.com/qIOu2vz.png)
Thought the thin liner could use some support from the shroud so found these on an old project barrel and made some Delrin bushings for them. Added a drop of locktight to make sure they stay put.
![](https://i.imgur.com/ayJ1d3K.png)
When I had all of the parts together and the adapters made I figured it was time to put things together. So, I screwed the breech on and fergot to put the hammer in. Pull it apart and got that taken care.
Got the breech on again and then realized I fergot the transfer port. I had not even made the new transfer port yet. So, yanked it apart again and modified the steel transfer port that comes with the BMN breech. Put the T-port in and the breech back on for the third time.
The tube and hammer were completely dry so I put a drop of oil on them.
Finally luck was on my side and I got it all the way together this time.
But then I realized I don’t have a .177 Marauder magazine so I had to single load a few to test the gun.
Man is this thing hard to cock!! I could not get it to cock the first few tries. I thought something was not right but then it got a little better.
Talk about a lightweight gun! This one is that for sure. Put a Hawke 2 x 7 compact scope on it to keep the weight down.
Yes, I know the barrel is a bit long I will make a carbon shroud for it soon enough but this one was already drilled and complete so made it easy.
With 12 baffles in the shroud it is dead quiet.
I left the internals stock as it was a .22 so it should be more than good power wise as a .177. If not I can fix that.
![](https://i.imgur.com/awhRFHc.png)
Still has that awful trigger though. I will take care of that soon enough.
Thinking about putting a regulator in it also.
Need to get a .177 magazine and go test this thing out. But it puts them through the same exact hole at ten meters.
EDIT;
Cost of the mod thus far;
$137 Gun shipped
$140 Breech
$30 Shroud $80 which will go down to $30 when I put the carbon tube on.
$35 Barrel band
$42 Power adjuster
$10 Brass rod say probly less as I did not use much.
$20 Magazine
$414 Total cost
$130 Huma reg soon to come and that will be about it.
$544 for a regulated, lightweight, well built and very accurate gun is a pretty good deal me thinks and far less than the $1000 I usually spend.
![](https://i.imgur.com/LX9gK4m.png)
So, since my Christmas gun was delayed and I was bored as I haven’t got out much with the temps in the 25-35F range and lots of rain and snow for the last couple weeks. So, I got the brand new never fired Maximus out and proceeded to tear it apart.
First thing I did was dive into my breech collection. Still have a few of the old BNM breeches, that take the Marauder magazines, so grabbed the only .177 there cuz I don't have a .177 PCP yet.
Found I still had an old shroud with baffles that fit the breech as well so, even though it was for a .22 I grabbed that and picked up the matching barrel band too.
Found a power adjuster in one of my boxes and the gun thought it should have it also.
What to do for a barrel? Then noticed I still have my Impact 500mm .177 barrel and thought I heard the liner saying softly use me.
![](https://i.imgur.com/qSrz7Le.png)
Then came all of that werq;
I had to make adapters for the liner to make it fit in the BNM breech so used some brass stock I had on hand.
Then as usual the breech can't go on with just that tiny 4/48 screw holding it in the middle. So, I drilled the new breech, all the way through, up front with a #29 bit and a larger one on top to allow the screw head to go through. I can put a #12 set screw in the hole. Then drilled and tapped the tube to accept the new 6/48 screw to hold it better.
![](https://i.imgur.com/XRsgKVU.png)
Decided to tap the breech up front so I can secure the liner with o-rings. Like FX does on the Crown. It was a pain to do and I messed the flats up in the vise while threading the piece. The threads are a bit sloppy but everything tightened up securely. I was impressed that the five squished up o-rings, behind that brass nut, really hold the liner tight.
![](https://i.imgur.com/qIOu2vz.png)
Thought the thin liner could use some support from the shroud so found these on an old project barrel and made some Delrin bushings for them. Added a drop of locktight to make sure they stay put.
![](https://i.imgur.com/ayJ1d3K.png)
When I had all of the parts together and the adapters made I figured it was time to put things together. So, I screwed the breech on and fergot to put the hammer in. Pull it apart and got that taken care.
Got the breech on again and then realized I fergot the transfer port. I had not even made the new transfer port yet. So, yanked it apart again and modified the steel transfer port that comes with the BMN breech. Put the T-port in and the breech back on for the third time.
The tube and hammer were completely dry so I put a drop of oil on them.
Finally luck was on my side and I got it all the way together this time.
But then I realized I don’t have a .177 Marauder magazine so I had to single load a few to test the gun.
Man is this thing hard to cock!! I could not get it to cock the first few tries. I thought something was not right but then it got a little better.
Talk about a lightweight gun! This one is that for sure. Put a Hawke 2 x 7 compact scope on it to keep the weight down.
Yes, I know the barrel is a bit long I will make a carbon shroud for it soon enough but this one was already drilled and complete so made it easy.
With 12 baffles in the shroud it is dead quiet.
I left the internals stock as it was a .22 so it should be more than good power wise as a .177. If not I can fix that.
![](https://i.imgur.com/awhRFHc.png)
Still has that awful trigger though. I will take care of that soon enough.
Thinking about putting a regulator in it also.
Need to get a .177 magazine and go test this thing out. But it puts them through the same exact hole at ten meters.
EDIT;
Cost of the mod thus far;
$137 Gun shipped
$140 Breech
$30 Shroud $80 which will go down to $30 when I put the carbon tube on.
$35 Barrel band
$42 Power adjuster
$10 Brass rod say probly less as I did not use much.
$20 Magazine
$414 Total cost
$130 Huma reg soon to come and that will be about it.
$544 for a regulated, lightweight, well built and very accurate gun is a pretty good deal me thinks and far less than the $1000 I usually spend.