Smk b2 air rifles

[Prepper1]

From my experience, high qualty air rifles are great IF YOU CAN AFFORD THEM IN THE FIRST PLACE.

If all you can afford is a cheap one thats that.

Anyway power quality wise Ive had the hw80, brilliant gun, very tunable, sometimes you can get old clunker 80's that need some love from a gun shop, you know that have been traded in.
Again I have an smk clone of the hw77 whilst it isnt a bad gun its nowhere in the same league as the hw's quality wise.

Parts however are fairly interchangeable, with a bit of fiddling.

For example my smk 77 clone has a record trigger unit copy, woeful in comparison to the real record unit.
I was going to fit a record unit, till I found out they were £80 plus quid on there own.

Quality kit, wanted it but couldn't afford it.

SO I bought the piston grabber part from a record unit for a tenner and with a bit of judicious filing fitted it to my smk clone.

Result is that the clone hw77 now cocks more smoothly.

If you compared the two trigger units from the real hw77 and the smk clone you can see the difference between Chinese craftsmanship and the equivalent German one.
For example the German unit is beautifully polished with NO casting marks visible if any parts were cast, my impression of the German unit would be they were machined from billet rather than cast like the Chinese version.

There lies the difference you see, rough cast parts work but they are rough in the lock up and the release
whilst the german unit is pure quality.

Dont dispair though, if all you can get is any smk you can vastly improve the quality by stripping it down before you fire even one shot because of the fact the chinese quality controls arent always that good and swarf from machining can be left inside.

That'll kill an air rifle within shots.

There a few online shops that sell replacement parts now for the smk's as they're becoming more popular.

Add a piston weight that speeds up lock time from trigger release to the time it hits the end of the chamber.

Fit a better mainspring, you may have to take your original to a gun shop and see which one of the ox mainsprings for example will fit.

You may have to cut a few coils off if youve added a piston weight, these can be made as mine by using washers or blocking a portion of the cocking slot in the piston and pouring lead down it to the required level than so the spring doesnt eat into the lead, fit a steel washer over the lead once cool, to give the spring a bearing surface.

The whole piston weight thing has to be done carefully though otherwise the gun wont cock properly as it interferes with the cocking slot.

You can also strip the trigger unit and polish with polishing compound the bearing surfaces for the trigger, sear etc...

I also give the internal of the chamber a bit of a polish with an electric drill with a polishing mop, although not to super shiny as the chamber needs some micro grooves to retain lubricant for the piston.

you can use silicon grease or the molybdenum stuff.

You can also increase the transfer port diameter slightly as this will allow the air faster passage to the pellet but dont over do it.

theres a fine line between tuning and ruining....