Friday, 30 June 2017

It's hard to know how to start this post, but I need to tell you that Wing Commander Sir Nigel Tetlington-Smythe, or Tet to his friends, had an accident last week and suffered a very serious brain injury. He passed away in hospital on Saturday 24th June.

He was useless with technology and I don't think he thought of himself as much of a writer either, but he loved this blog and was thrilled at the amount of views his posts got, how many fellow airgunners he met through it and how many people his tutorials helped. He would want me to leave the blog up in memory of him.

Wing Commander Sir Nigel Tetlington-Smythe, 'Tet', 05/10/1964 - 24/06/2017.

Sunday, 11 June 2017

The Original Japanese Mk II 177. Sharp Innova Multi-pump Air Rifle, Review and Accuracy Test

The Sharp Innova is not a pellet fussy air rifle.

Oh no! Not another bloody blog about the bloody Innova!

In my most honest and humble opinion the Sharp Innova is an awesomely but simply designed multi pump air rifle, people in general tend to either love it or hate it, i myself, you may have gathered, i love it (Not unlike Jeremy Corbyn, old, honest, and reliable). This is the original Japanese Sharp Innova i'm talking about,not the later Chinese and Pacific Rim copies, and not that bloody awful Webley Rebel either.

A well thought out design, nice and simple.

Externally it has a rather blocky stock and forearm (the wood is solid and does not splinter or chip as a rule),

Though stained and varnished, the woodwork is solid.

a polymer/plastic reciever,

Even the plastic reciever is pretty tough.

and front sight housing that supports the metal barrel, pump tube and pump arm, a 10mm rifled inner barrel, and annoyly brittle plastic outer barrel sleeve

Some parts can be easily bodged

 At 90 cm's long the rifle feels compact and well balanced,

Compact little powerhouse.

The stock is held onto the reciever with one screw that secures it to the brass valve within the compression tube inside the plastic reciever, this is the heaviest and most solid part of the rifle body.

Without this one screw the whole thing falls apart.

The forearm is held onto the pump arm with two metal pins, this gives a comfortable hold for pumping.

A small piece of rubber inside the pump arm reduces the noise of pumping.

  Besides having MkII written on the reciever the only other things to denote it externally as a MkII are the plastic buttpad,

It may be ineffective as a butt pad but it does add character.

and a metal safety switch on the metal trigger guard that stops the plastic trigger from moving when engaged. There is also a small ajustment screw on the trigger which alters 1st stage travel, these tend to be missing on most 2nd hand Innova's and really is of no great loss too the airgunning world.

The safety is not automatically set, which to most people is a bonus.

When Sharp Introduced the Innova to the public in the late 70's/ early 80's the idea of all this plastic went against the grain with a lot of people, but the majority who actually got to use one soon realised it was a very accurate, powerful, and reliable air gun. The use of plastic for many external pasts proved to make it very robust with no blueing to scratch up, after 30 odd years though the plastic has started to get brittle in places and i've had my fair share of Innova's with chipped and snapped off bits. Still i have managed to fix, bodge or by-pass many of these problems, ending up with a rifle that handles as good as it ever has.

Loading pellets can be a little fiddly at first, until one gets the hang of it. With the rifle held at a 45 degree cant and a pellet placed at the bottom of the loading port, the pellet will easily roll into the breech with a small tilt of the rifle. 

The problems of a small and fiddly loading port can be easily overcome.

The bolt is sprung loaded, when the small catch at the rear of the reciever is pushed down the bolt springs open. 

The recess in the bolt is for the lever to hold it in place.

Once the pellet is loaded the bolt is pushed back in place into the reciever and seals the breech, the catch lever is pushed back up under spring tension to hold the bolt in place. 

Bolt held in place under spring tension.

Two O rings on the bolt seal the breech, loading the pellet is best done after the rifle has been charged/pumped up.

The rifle is kept under 12 ft/lb using an adjustable blow off valve built into the pump head, most Innova's will blow off excess air and leave enough air pressure to fire a pellet within an 10 FPS spread over many shots.

The large pump head houses the valve for blowing off excess air pressure.

Before any tinkering is done on the rifle, 7 or 8 pumps will charge it enough for one full powered shot.  After fine adjustment of the pump assembly, it is possible to get 12 ft/lb with 4 or 5 pumps in .177 and 3 or 4 pumps in .22.

 Supporting the rifle by the back of the reciever and pistol grip allows for the most effective pump stroke.

Squeezing the trigger will dump all the air in the valve and fire the pellet, this rifle has an exhaust valve where a sear block holds the firing pin in place. Moving the sear out of the way of the firing pin allows the pressurized air in the valve to force the pin back, with the valve empty a spring will push the firing pin back in place to seal the valve for the preparation of the next shot.

An adjustable butt pad would be a good investment for this rifle.

The pump arm swings back 60 degrees to allow air into the compression tube,

The pump arm at full extention, the front sight housing stops the pump arm from going any further.

more force is needed on the pump arm the more pumps applied. The same with the trigger pull, because the more pressure that is in the valve the harder the firing pin pushes against the sear block and the harder it is to move it with the trigger. At 12 ft/lb the trigger release is still comfortable so the Innova is still very accurate, this is due to the trigger pull, a decent barrel, and the near zero recoil of a pnuematic rifle.

Shooting offhand in windy conditions does not make for the most accurate of groupings.

Fired from a rest in good conditions sub half inch groups at 25 yards are easily achievable, however a scope is usually needed for these better results.

I must get a pellet trap as the kids get really annoyed when i shoot their toys.

A simple rear open sight that clamps onto the scope rail comes fitted to the rifle, unfortunatly these tend to get lost easily as is the case with all but one of the many Innova's i have had the good fortune to own or work  on.

An Innova in decent condition for sale at around £200 will sell easily, and if it's well cared for all it's life will still be working and have all it's original parts. However, if someone has tried to ramp up the power on one in the past, it will have put excessive wear on a lot of the parts. Luckily replacement parts are reletively cheap and available from various places, they are also pretty easy to work on (I've done more than enough blogs about Innova's in the past to prove this).

My opinion? Good air rifles, i love 'em.

All the best,

Wing commander Sir Nigel Tetlington-Smythe