Some notes on the prevalence of firearms on Tenerife – they will be rare – perhaps 10% of a community will have guns and ammunition will be rarer after 30 years.
Bodyguards can use .38 pistols and high profile or threatened individuals can apply for a concealed carry license. Around 70,000 targeting shooting pistol licenses have been issued in Spain as opposed to 8,000 authorised to carry a combat pistol for self defence. This contrasts with total 3 million arms registered with 1.1 million Spanish gun owners.
Hunting weapons are available. Legally Magazine capacity for semi-automatic centerfire rifles is limited to 4 rounds for sports shooting and 2 rounds for hunting; semi-automatic shotguns are limited to 3 rounds. Rimfire rifles, regardless of type have no magazine limit. Rifles chambered for certain cartridges with military origins are prohibited, such as .223/5.56 NATO and .50 BMG. The .308 Winchester and 7.62×39 mm (AK round) cartridges are only permitted in bolt-action, repetition or single-shot firearms.
WW2 era weapons from chases left in case of allies invasion.
1950s Spanish Army rifles like the Mauser derived FR7 , FR 8 and CETME model 58 ancestor of the heckler and Koch G3. These could be army surplus stocks or NATO gladio caches.
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Postwar SMGs like the Star Z-63, Z84 or CETME C2could also be in sane caches.
Spanish police have guns like the universal service pistol & H&K MP5 , G36 rifle and G3 rifle
The Spanish Army also uses the USP and G36 with other arms – there are multiple units on Tenerife. 
- 160 automatic pistols / revolvers
- 1400 target pistols
- 58,500 other weapons (hunting / target long arms – say 30% rim fire rifles, 60% shotguns & 10% centre fire rifles )
- Say 1000 modern military guns (say 80% G36)
- Say 1000 modern police guns (say 80% pistols)
- Say 1000 antiquated military guns (say 80% rifles – 50% WW2 and 50% post war)
- Criminal weapons say 2,000 (say 80% handguns – then 10% shotguns, 5% SMGs and 5% assault rifles )
Plenty of material for a random weapons table.
This is a plentiful supply for the post disaster population of Tenerife – however ammunition is likely to be precious after 30 years of post fall conflict. Very few communities will be able to reload brass – some might have engineered the process but with primitive power producing single shot weapons – all will not be as it seems.
Over time they find in the course of comets passing the debris led to some nuclear panics and limited exchanges and skirmishes. While it stopped short of Armageddon combined with the internet and communications destruction caused it led to social collapse.
